diff --git a/Yoga.podspec b/Yoga.podspec
index 4ebb5adff3..847b37735f 100644
--- a/Yoga.podspec
+++ b/Yoga.podspec
@@ -32,6 +32,7 @@ Pod::Spec.new do |spec|
       '-Wall',
       '-Werror',
       '-Wextra',
+      '-Wconversion',
       '-std=c++17',
       '-fPIC'
   ]
diff --git a/cmake/project-defaults.cmake b/cmake/project-defaults.cmake
index d02a2836df..8868ce93d9 100644
--- a/cmake/project-defaults.cmake
+++ b/cmake/project-defaults.cmake
@@ -35,6 +35,7 @@ add_compile_options(
     -Wall
     -Wextra
     -Werror
+    -Wconversion
     # Disable RTTI
     $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>
     # Use -O2 (prioritize speed)
diff --git a/tests/NumericBitfieldTest.cpp b/tests/NumericBitfieldTest.cpp
index 9b487cee21..4c25d56f84 100644
--- a/tests/NumericBitfieldTest.cpp
+++ b/tests/NumericBitfieldTest.cpp
@@ -13,7 +13,7 @@
 namespace facebook::yoga {
 
 TEST(NumericBitfield, one_boolean_defaults_to_false) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
 
   ASSERT_EQ(getBooleanData(flags, 0), false);
   static_assert(
@@ -22,7 +22,7 @@ TEST(NumericBitfield, one_boolean_defaults_to_false) {
 }
 
 TEST(NumericBitfield, one_boolean_can_be_initialized_to_true) {
-  constexpr uint8_t flags = 1;
+  constexpr uint32_t flags = 1;
 
   ASSERT_EQ(getBooleanData(flags, 0), true);
   static_assert(
@@ -31,14 +31,14 @@ TEST(NumericBitfield, one_boolean_can_be_initialized_to_true) {
 }
 
 TEST(NumericBitfield, one_boolean_can_be_set_to_true) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
 
   setBooleanData(flags, 0, true);
   ASSERT_EQ(getBooleanData(flags, 0), true);
 }
 
 TEST(NumericBitfield, second_boolean_defaults_to_false) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
 
   ASSERT_EQ(getBooleanData(flags, 1), false);
   static_assert(
@@ -47,7 +47,7 @@ TEST(NumericBitfield, second_boolean_defaults_to_false) {
 }
 
 TEST(NumericBitfield, second_boolean_can_be_initialized_to_true) {
-  constexpr uint8_t flags = 2;
+  constexpr uint32_t flags = 2;
 
   ASSERT_EQ(getBooleanData(flags, 0), false);
   ASSERT_EQ(getBooleanData(flags, 1), true);
@@ -60,7 +60,7 @@ TEST(NumericBitfield, second_boolean_can_be_initialized_to_true) {
 }
 
 TEST(NumericBitfield, second_boolean_can_be_set_to_true) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
 
   setBooleanData(flags, 1, true);
   ASSERT_EQ(getBooleanData(flags, 0), false);
@@ -68,7 +68,7 @@ TEST(NumericBitfield, second_boolean_can_be_set_to_true) {
 }
 
 TEST(NumericBitfield, third_boolean_defaults_to_false) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
 
   ASSERT_EQ(getBooleanData(flags, 2), false);
   static_assert(
@@ -77,7 +77,7 @@ TEST(NumericBitfield, third_boolean_defaults_to_false) {
 }
 
 TEST(NumericBitfield, third_boolean_can_be_initialized_to_true) {
-  constexpr uint8_t flags = 4;
+  constexpr uint32_t flags = 4;
 
   ASSERT_EQ(getBooleanData(flags, 0), false);
   ASSERT_EQ(getBooleanData(flags, 1), false);
@@ -94,7 +94,7 @@ TEST(NumericBitfield, third_boolean_can_be_initialized_to_true) {
 }
 
 TEST(NumericBitfield, third_boolean_can_be_set_to_true) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
 
   setBooleanData(flags, 2, true);
   ASSERT_EQ(getBooleanData(flags, 0), false);
@@ -103,7 +103,7 @@ TEST(NumericBitfield, third_boolean_can_be_set_to_true) {
 }
 
 TEST(NumericBitfield, setting_boolean_values_does_not_spill_over) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
 
   setBooleanData(flags, 1, (bool) 7);
 
@@ -113,7 +113,7 @@ TEST(NumericBitfield, setting_boolean_values_does_not_spill_over) {
 }
 
 TEST(NumericBitfield, first_enum_defaults_to_0) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
 
   ASSERT_EQ(getEnumData<YGAlign>(flags, 0), YGAlignAuto);
   static_assert(
@@ -122,7 +122,7 @@ TEST(NumericBitfield, first_enum_defaults_to_0) {
 }
 
 TEST(NumericBitfield, first_enum_can_be_set) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
 
   setEnumData<YGAlign>(flags, 0, YGAlignSpaceBetween);
 
@@ -130,7 +130,7 @@ TEST(NumericBitfield, first_enum_can_be_set) {
 }
 
 TEST(NumericBitfield, second_enum_defaults_to_0) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
   static constexpr size_t alignOffset = 0;
   static constexpr size_t edgeOffset = 3;
 
@@ -145,7 +145,7 @@ TEST(NumericBitfield, second_enum_defaults_to_0) {
 }
 
 TEST(NumericBitfield, second_enum_can_be_set) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
   static constexpr size_t alignOffset = 0;
   static constexpr size_t edgeOffset = 3;
 
@@ -156,7 +156,7 @@ TEST(NumericBitfield, second_enum_can_be_set) {
 }
 
 TEST(NumericBitfield, third_enum_defaults_to_0) {
-  constexpr uint8_t flags = 0;
+  constexpr uint32_t flags = 0;
   static constexpr size_t alignOffset = 0;
   static constexpr size_t boolOffset = 3;
   static constexpr size_t edgesOffset = 4;
@@ -176,7 +176,7 @@ TEST(NumericBitfield, third_enum_defaults_to_0) {
 }
 
 TEST(NumericBitfield, third_enum_can_be_set) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
   static constexpr size_t alignOffset = 0;
   static constexpr size_t boolOffset = 3;
   static constexpr size_t edgesOffset = 4;
@@ -189,7 +189,7 @@ TEST(NumericBitfield, third_enum_can_be_set) {
 }
 
 TEST(NumericBitfield, setting_values_does_not_spill_over) {
-  uint8_t flags = 0;
+  uint32_t flags = 0;
   static constexpr size_t alignOffset = 0;
   static constexpr size_t edgesOffset = 3;
   static constexpr size_t boolOffset = 7;
diff --git a/yoga/algorithm/CalculateLayout.cpp b/yoga/algorithm/CalculateLayout.cpp
index e6a3dd5aaa..d2bc46b6cc 100644
--- a/yoga/algorithm/CalculateLayout.cpp
+++ b/yoga/algorithm/CalculateLayout.cpp
@@ -823,8 +823,8 @@ static void zeroOutLayoutRecursively(
     yoga::Node* const node,
     void* layoutContext) {
   node->getLayout() = {};
-  node->setLayoutDimension(0, 0);
-  node->setLayoutDimension(0, 1);
+  node->setLayoutDimension(0, YGDimensionWidth);
+  node->setLayoutDimension(0, YGDimensionHeight);
   node->setHasNewLayout(true);
 
   node->iterChildrenAfterCloningIfNeeded(
@@ -1488,19 +1488,19 @@ static void YGJustifyMainAxis(
           betweenMainDim +=
               yoga::maxOrDefined(
                   collectedFlexItemsValues.remainingFreeSpace, 0) /
-              (collectedFlexItemsValues.itemsOnLine - 1);
+              static_cast<float>(collectedFlexItemsValues.itemsOnLine - 1);
         }
         break;
       case YGJustifySpaceEvenly:
         // Space is distributed evenly across all elements
         leadingMainDim = collectedFlexItemsValues.remainingFreeSpace /
-            (collectedFlexItemsValues.itemsOnLine + 1);
+            static_cast<float>(collectedFlexItemsValues.itemsOnLine + 1);
         betweenMainDim += leadingMainDim;
         break;
       case YGJustifySpaceAround:
         // Space on the edges is half of the space between elements
         leadingMainDim = 0.5f * collectedFlexItemsValues.remainingFreeSpace /
-            collectedFlexItemsValues.itemsOnLine;
+            static_cast<float>(collectedFlexItemsValues.itemsOnLine);
         betweenMainDim += leadingMainDim * 2;
         break;
       case YGJustifyFlexStart:
@@ -1550,7 +1550,7 @@ static void YGJustifyMainAxis(
         if (child->marginLeadingValue(mainAxis).unit == YGUnitAuto) {
           collectedFlexItemsValues.mainDim +=
               collectedFlexItemsValues.remainingFreeSpace /
-              numberOfAutoMarginsOnCurrentLine;
+              static_cast<float>(numberOfAutoMarginsOnCurrentLine);
         }
 
         if (performLayout) {
@@ -1563,7 +1563,7 @@ static void YGJustifyMainAxis(
         if (child->marginTrailingValue(mainAxis).unit == YGUnitAuto) {
           collectedFlexItemsValues.mainDim +=
               collectedFlexItemsValues.remainingFreeSpace /
-              numberOfAutoMarginsOnCurrentLine;
+              static_cast<float>(numberOfAutoMarginsOnCurrentLine);
         }
         bool canSkipFlex =
             !performLayout && measureModeCrossDim == YGMeasureModeExactly;
@@ -1890,7 +1890,7 @@ static void calculateLayoutImpl(
   if (childCount > 1) {
     totalMainDim +=
         node->getGapForAxis(mainAxis, availableInnerCrossDim).unwrap() *
-        (childCount - 1);
+        static_cast<float>(childCount - 1);
   }
 
   const bool mainAxisOverflows =
@@ -2261,14 +2261,17 @@ static void calculateLayoutImpl(
           break;
         case YGAlignStretch:
           if (availableInnerCrossDim > totalLineCrossDim) {
-            crossDimLead = remainingAlignContentDim / lineCount;
+            crossDimLead =
+                remainingAlignContentDim / static_cast<float>(lineCount);
           }
           break;
         case YGAlignSpaceAround:
           if (availableInnerCrossDim > totalLineCrossDim) {
-            currentLead += remainingAlignContentDim / (2 * lineCount);
+            currentLead +=
+                remainingAlignContentDim / (2 * static_cast<float>(lineCount));
             if (lineCount > 1) {
-              crossDimLead = remainingAlignContentDim / lineCount;
+              crossDimLead =
+                  remainingAlignContentDim / static_cast<float>(lineCount);
             }
           } else {
             currentLead += remainingAlignContentDim / 2;
@@ -2276,7 +2279,8 @@ static void calculateLayoutImpl(
           break;
         case YGAlignSpaceBetween:
           if (availableInnerCrossDim > totalLineCrossDim && lineCount > 1) {
-            crossDimLead = remainingAlignContentDim / (lineCount - 1);
+            crossDimLead =
+                remainingAlignContentDim / static_cast<float>(lineCount - 1);
           }
           break;
         case YGAlignAuto:
@@ -2843,11 +2847,11 @@ bool calculateLayoutInternal(
     layout->lastOwnerDirection = ownerDirection;
 
     if (cachedResults == nullptr) {
-      if (layout->nextCachedMeasurementsIndex + 1 >
-          (uint32_t) layoutMarkerData.maxMeasureCache) {
-        layoutMarkerData.maxMeasureCache =
-            layout->nextCachedMeasurementsIndex + 1;
-      }
+
+      layoutMarkerData.maxMeasureCache = std::max(
+          layoutMarkerData.maxMeasureCache,
+          layout->nextCachedMeasurementsIndex + 1u);
+
       if (layout->nextCachedMeasurementsIndex ==
           LayoutResults::MaxCachedMeasurements) {
         if (gPrintChanges) {
diff --git a/yoga/bits/NumericBitfield.h b/yoga/bits/NumericBitfield.h
index af3fc6927d..358c4ab7d5 100644
--- a/yoga/bits/NumericBitfield.h
+++ b/yoga/bits/NumericBitfield.h
@@ -15,12 +15,12 @@
 
 namespace facebook::yoga::details {
 
-constexpr size_t log2ceilFn(size_t n) {
+constexpr uint8_t log2ceilFn(uint8_t n) {
   return n < 1 ? 0 : (1 + log2ceilFn(n / 2));
 }
 
-constexpr int mask(size_t bitWidth, size_t index) {
-  return ((1 << bitWidth) - 1) << index;
+constexpr uint32_t mask(uint8_t bitWidth, uint8_t index) {
+  return ((1u << bitWidth) - 1u) << index;
 }
 
 } // namespace facebook::yoga::details
@@ -29,38 +29,31 @@ namespace facebook::yoga {
 
 // The number of bits necessary to represent enums defined with YG_ENUM_SEQ_DECL
 template <typename Enum>
-constexpr size_t minimumBitCount() {
+constexpr uint8_t minimumBitCount() {
   static_assert(
       enums::count<Enum>() > 0, "Enums must have at least one entries");
   return details::log2ceilFn(enums::count<Enum>() - 1);
 }
 
 template <typename Enum>
-constexpr Enum getEnumData(int flags, size_t index) {
+constexpr Enum getEnumData(uint32_t flags, uint8_t index) {
   return static_cast<Enum>(
       (flags & details::mask(minimumBitCount<Enum>(), index)) >> index);
 }
 
 template <typename Enum>
-void setEnumData(uint32_t& flags, size_t index, int newValue) {
-  flags = (flags & ~details::mask(minimumBitCount<Enum>(), index)) |
-      ((newValue << index) & (details::mask(minimumBitCount<Enum>(), index)));
-}
-
-template <typename Enum>
-void setEnumData(uint8_t& flags, size_t index, int newValue) {
+void setEnumData(uint32_t& flags, uint8_t index, uint32_t newValue) {
   flags =
       (flags &
-       ~static_cast<uint8_t>(details::mask(minimumBitCount<Enum>(), index))) |
-      ((newValue << index) &
-       (static_cast<uint8_t>(details::mask(minimumBitCount<Enum>(), index))));
+       ~static_cast<uint32_t>(details::mask(minimumBitCount<Enum>(), index))) |
+      ((newValue << index) & (details::mask(minimumBitCount<Enum>(), index)));
 }
 
-constexpr bool getBooleanData(int flags, size_t index) {
+constexpr bool getBooleanData(uint32_t flags, uint8_t index) {
   return (flags >> index) & 1;
 }
 
-inline void setBooleanData(uint8_t& flags, size_t index, bool value) {
+inline void setBooleanData(uint32_t& flags, uint8_t index, bool value) {
   if (value) {
     flags |= 1 << index;
   } else {
diff --git a/yoga/debug/NodeToString.cpp b/yoga/debug/NodeToString.cpp
index 756f480098..449fbc7012 100644
--- a/yoga/debug/NodeToString.cpp
+++ b/yoga/debug/NodeToString.cpp
@@ -33,7 +33,7 @@ static void appendFormattedString(std::string& str, const char* fmt, ...) {
   va_start(args, fmt);
   va_list argsCopy;
   va_copy(argsCopy, args);
-  std::vector<char> buf(1 + vsnprintf(NULL, 0, fmt, args));
+  std::vector<char> buf(1 + static_cast<size_t>(vsnprintf(NULL, 0, fmt, args)));
   va_end(args);
   vsnprintf(buf.data(), buf.size(), fmt, argsCopy);
   va_end(argsCopy);
@@ -96,7 +96,7 @@ static void appendEdges(
   } else {
     for (int edge = YGEdgeLeft; edge != YGEdgeAll; ++edge) {
       std::string str = key + "-" + YGEdgeToString(static_cast<YGEdge>(edge));
-      appendNumberIfNotZero(base, str, edges[edge]);
+      appendNumberIfNotZero(base, str, edges[static_cast<size_t>(edge)]);
     }
   }
 }
diff --git a/yoga/event/event.h b/yoga/event/event.h
index 3798e4663e..fca12aca63 100644
--- a/yoga/event/event.h
+++ b/yoga/event/event.h
@@ -38,7 +38,7 @@ enum struct LayoutPassReason : int {
 struct LayoutData {
   int layouts;
   int measures;
-  int maxMeasureCache;
+  uint32_t maxMeasureCache;
   int cachedLayouts;
   int cachedMeasures;
   int measureCallbacks;
diff --git a/yoga/node/LayoutResults.h b/yoga/node/LayoutResults.h
index 95b4a21bf8..7d25e33c09 100644
--- a/yoga/node/LayoutResults.h
+++ b/yoga/node/LayoutResults.h
@@ -15,6 +15,14 @@
 
 namespace facebook::yoga {
 
+#pragma pack(push)
+#pragma pack(1)
+struct LayoutResultFlags {
+  uint8_t direction : 2;
+  bool hadOverflow : 1;
+};
+#pragma pack(pop)
+
 struct LayoutResults {
   // This value was chosen based on empirical data:
   // 98% of analyzed layouts require less than 8 entries.
@@ -27,10 +35,7 @@ struct LayoutResults {
   std::array<float, 4> padding = {};
 
 private:
-  static constexpr size_t directionOffset = 0;
-  static constexpr size_t hadOverflowOffset =
-      directionOffset + minimumBitCount<YGDirection>();
-  uint8_t flags = 0;
+  LayoutResultFlags flags_{};
 
 public:
   uint32_t computedFlexBasisGeneration = 0;
@@ -48,17 +53,15 @@ struct LayoutResults {
   CachedMeasurement cachedLayout{};
 
   YGDirection direction() const {
-    return getEnumData<YGDirection>(flags, directionOffset);
+    return static_cast<YGDirection>(flags_.direction);
   }
 
   void setDirection(YGDirection direction) {
-    setEnumData<YGDirection>(flags, directionOffset, direction);
+    flags_.direction = static_cast<uint8_t>(direction);
   }
 
-  bool hadOverflow() const { return getBooleanData(flags, hadOverflowOffset); }
-  void setHadOverflow(bool hadOverflow) {
-    setBooleanData(flags, hadOverflowOffset, hadOverflow);
-  }
+  bool hadOverflow() const { return flags_.hadOverflow; }
+  void setHadOverflow(bool hadOverflow) { flags_.hadOverflow = hadOverflow; }
 
   bool operator==(LayoutResults layout) const;
   bool operator!=(LayoutResults layout) const { return !(*this == layout); }
diff --git a/yoga/node/Node.cpp b/yoga/node/Node.cpp
index eb674a1dfe..70a81bd182 100644
--- a/yoga/node/Node.cpp
+++ b/yoga/node/Node.cpp
@@ -6,6 +6,7 @@
  */
 
 #include <algorithm>
+#include <cstddef>
 #include <iostream>
 
 #include <yoga/algorithm/FlexDirection.h>
@@ -264,7 +265,7 @@ YOGA_EXPORT void Node::setMeasureFunc(MeasureWithContextFn measureFunc) {
   setMeasureFunc(m);
 }
 
-void Node::replaceChild(Node* child, uint32_t index) {
+void Node::replaceChild(Node* child, size_t index) {
   children_[index] = child;
 }
 
@@ -272,8 +273,8 @@ void Node::replaceChild(Node* oldChild, Node* newChild) {
   std::replace(children_.begin(), children_.end(), oldChild, newChild);
 }
 
-void Node::insertChild(Node* child, uint32_t index) {
-  children_.insert(children_.begin() + index, child);
+void Node::insertChild(Node* child, size_t index) {
+  children_.insert(children_.begin() + static_cast<ptrdiff_t>(index), child);
 }
 
 void Node::setConfig(yoga::Config* config) {
@@ -311,24 +312,30 @@ bool Node::removeChild(Node* child) {
   return false;
 }
 
-void Node::removeChild(uint32_t index) {
-  children_.erase(children_.begin() + index);
+void Node::removeChild(size_t index) {
+  children_.erase(children_.begin() + static_cast<ptrdiff_t>(index));
 }
 
 void Node::setLayoutDirection(YGDirection direction) {
   layout_.setDirection(direction);
 }
 
-void Node::setLayoutMargin(float margin, int index) {
-  layout_.margin[index] = margin;
+void Node::setLayoutMargin(float margin, YGEdge edge) {
+  assertFatal(
+      edge < layout_.margin.size(), "Edge must be top/left/bottom/right");
+  layout_.margin[edge] = margin;
 }
 
-void Node::setLayoutBorder(float border, int index) {
-  layout_.border[index] = border;
+void Node::setLayoutBorder(float border, YGEdge edge) {
+  assertFatal(
+      edge < layout_.border.size(), "Edge must be top/left/bottom/right");
+  layout_.border[edge] = border;
 }
 
-void Node::setLayoutPadding(float padding, int index) {
-  layout_.padding[index] = padding;
+void Node::setLayoutPadding(float padding, YGEdge edge) {
+  assertFatal(
+      edge < layout_.padding.size(), "Edge must be top/left/bottom/right");
+  layout_.padding[edge] = padding;
 }
 
 void Node::setLayoutLastOwnerDirection(YGDirection direction) {
@@ -339,8 +346,10 @@ void Node::setLayoutComputedFlexBasis(const FloatOptional computedFlexBasis) {
   layout_.computedFlexBasis = computedFlexBasis;
 }
 
-void Node::setLayoutPosition(float position, int index) {
-  layout_.position[index] = position;
+void Node::setLayoutPosition(float position, YGEdge edge) {
+  assertFatal(
+      edge < layout_.position.size(), "Edge must be top/left/bottom/right");
+  layout_.position[edge] = position;
 }
 
 void Node::setLayoutComputedFlexBasisGeneration(
@@ -348,16 +357,19 @@ void Node::setLayoutComputedFlexBasisGeneration(
   layout_.computedFlexBasisGeneration = computedFlexBasisGeneration;
 }
 
-void Node::setLayoutMeasuredDimension(float measuredDimension, int index) {
-  layout_.measuredDimensions[index] = measuredDimension;
+void Node::setLayoutMeasuredDimension(
+    float measuredDimension,
+    YGDimension dimension) {
+  layout_.measuredDimensions[static_cast<size_t>(dimension)] =
+      measuredDimension;
 }
 
 void Node::setLayoutHadOverflow(bool hadOverflow) {
   layout_.setHadOverflow(hadOverflow);
 }
 
-void Node::setLayoutDimension(float dimension, int index) {
-  layout_.dimensions[index] = dimension;
+void Node::setLayoutDimension(float dimensionValue, YGDimension dimension) {
+  layout_.dimensions[static_cast<size_t>(dimension)] = dimensionValue;
 }
 
 // If both left and right are defined, then use left. Otherwise return +left or
diff --git a/yoga/node/Node.h b/yoga/node/Node.h
index 4116e5a6dc..ebedd863a5 100644
--- a/yoga/node/Node.h
+++ b/yoga/node/Node.h
@@ -181,8 +181,8 @@ class YOGA_EXPORT Node : public ::YGNode {
     return resolvedDimensions_;
   }
 
-  YGValue getResolvedDimension(int index) const {
-    return resolvedDimensions_[index];
+  YGValue getResolvedDimension(YGDimension dimension) const {
+    return resolvedDimensions_[static_cast<size_t>(dimension)];
   }
 
   static CompactValue computeEdgeValueForColumn(
@@ -303,14 +303,16 @@ class YOGA_EXPORT Node : public ::YGNode {
   void setLayoutComputedFlexBasis(const FloatOptional computedFlexBasis);
   void setLayoutComputedFlexBasisGeneration(
       uint32_t computedFlexBasisGeneration);
-  void setLayoutMeasuredDimension(float measuredDimension, int index);
+  void setLayoutMeasuredDimension(
+      float measuredDimension,
+      YGDimension dimension);
   void setLayoutHadOverflow(bool hadOverflow);
-  void setLayoutDimension(float dimension, int index);
+  void setLayoutDimension(float dimensionValue, YGDimension dimension);
   void setLayoutDirection(YGDirection direction);
-  void setLayoutMargin(float margin, int index);
-  void setLayoutBorder(float border, int index);
-  void setLayoutPadding(float padding, int index);
-  void setLayoutPosition(float position, int index);
+  void setLayoutMargin(float margin, YGEdge edge);
+  void setLayoutBorder(float border, YGEdge edge);
+  void setLayoutPadding(float padding, YGEdge edge);
+  void setLayoutPosition(float position, YGEdge edge);
   void setPosition(
       const YGDirection direction,
       const float mainSize,
@@ -327,11 +329,11 @@ class YOGA_EXPORT Node : public ::YGNode {
   void clearChildren();
   /// Replaces the occurrences of oldChild with newChild
   void replaceChild(Node* oldChild, Node* newChild);
-  void replaceChild(Node* child, uint32_t index);
-  void insertChild(Node* child, uint32_t index);
+  void replaceChild(Node* child, size_t index);
+  void insertChild(Node* child, size_t index);
   /// Removes the first occurrence of child
   bool removeChild(Node* child);
-  void removeChild(uint32_t index);
+  void removeChild(size_t index);
 
   void cloneChildrenIfNeeded(void*);
   void markDirtyAndPropagate();
diff --git a/yoga/style/Style.h b/yoga/style/Style.h
index 7b3ca9dd2d..5b78fa31e5 100644
--- a/yoga/style/Style.h
+++ b/yoga/style/Style.h
@@ -36,7 +36,7 @@ class YOGA_EXPORT Style {
   template <typename T>
   struct BitfieldRef {
     Style& style;
-    size_t offset;
+    uint8_t offset;
     operator T() const { return getEnumData<T>(style.flags, offset); }
     BitfieldRef<T>& operator=(T x) {
       setEnumData<T>(style.flags, offset, x);
@@ -84,24 +84,24 @@ class YOGA_EXPORT Style {
   ~Style() = default;
 
 private:
-  static constexpr size_t directionOffset = 0;
-  static constexpr size_t flexdirectionOffset =
+  static constexpr uint8_t directionOffset = 0;
+  static constexpr uint8_t flexdirectionOffset =
       directionOffset + minimumBitCount<YGDirection>();
-  static constexpr size_t justifyContentOffset =
+  static constexpr uint8_t justifyContentOffset =
       flexdirectionOffset + minimumBitCount<YGFlexDirection>();
-  static constexpr size_t alignContentOffset =
+  static constexpr uint8_t alignContentOffset =
       justifyContentOffset + minimumBitCount<YGJustify>();
-  static constexpr size_t alignItemsOffset =
+  static constexpr uint8_t alignItemsOffset =
       alignContentOffset + minimumBitCount<YGAlign>();
-  static constexpr size_t alignSelfOffset =
+  static constexpr uint8_t alignSelfOffset =
       alignItemsOffset + minimumBitCount<YGAlign>();
-  static constexpr size_t positionTypeOffset =
+  static constexpr uint8_t positionTypeOffset =
       alignSelfOffset + minimumBitCount<YGAlign>();
-  static constexpr size_t flexWrapOffset =
+  static constexpr uint8_t flexWrapOffset =
       positionTypeOffset + minimumBitCount<YGPositionType>();
-  static constexpr size_t overflowOffset =
+  static constexpr uint8_t overflowOffset =
       flexWrapOffset + minimumBitCount<YGWrap>();
-  static constexpr size_t displayOffset =
+  static constexpr uint8_t displayOffset =
       overflowOffset + minimumBitCount<YGOverflow>();
 
   uint32_t flags = 0;