Panic error when marshalling string with decimal value

[swang2798]

I'm using the UnmarshalString and MarshalBinary function to parse an Ion string to a struct and then convert it into binary.

Works fine with the following example

	var testString = `
		{
		  key1:"hello",
                  key2:"hello",
		}
	`
	var testStruct map[string]any
	ion.UnmarshalString(testString, &testStruct)
	t.Log(testStruct)
	var resultBinary, _ = ion.MarshalBinary(testStruct)
	t.Log(resultBinary)

Output

    utils_test.go:303: map[key1:hello key2:hello]
    utils_test.go:307: [224 1 0 234 238 143 129 131 220 135 186 132 107 101 121 49 132 107 101 121 50 222 142 138 133 104 101 108 108 111 139 133 104 101 108 108 111]

However, if my Ion String contains a decimal, I notice the library runs into problems.

	var testString = `
		{
		  key1:"hello",
                  key2:1.2,
		}
	`
	var testStruct map[string]any
	ion.UnmarshalString(testString, &testStruct)
	t.Log(testStruct)
	var resultBinary, _ = ion.MarshalBinary(testStruct)
	t.Log(resultBinary)

Output

utils_test.go:303: map[key1:hello key2:{0x140001ea820 1 false}]
    
panic: reflect.Value.Addr of unaddressable value [recovered]
	panic: reflect.Value.Addr of unaddressable value

goroutine 6 [running]:
testing.tRunner.func1.2({0x103915580, 0x103aa2f60})
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/testing/testing.go:1632 +0x1bc
testing.tRunner.func1()
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/testing/testing.go:1635 +0x334
panic({0x103915580?, 0x103aa2f60?})
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/runtime/panic.go:785 +0x124
reflect.Value.Addr({0x1039df1c0?, 0x140002c3320?, 0x18?})
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/reflect/value.go:268 +0x64
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeDecimal(0x14000123ec8, {0x1039df1c0?, 0x140002c3320?, 0x0?})
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:453 +0x34
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeStruct(0x14000123ec8, {0x1039df1c0?, 0x140002c3320?, 0x102f72180?})
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:385 +0x2b8
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeValue(0x14000123ec8, {0x1039df1c0?, 0x140002c3320?, 0x103319e3c?}, 0x0)
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:236 +0x608
github.com/amazon-ion/ion-go/ion.(*Encoder).encodePtr(0x14000123ec8, {0x103946cc0?, 0x140002c3430?, 0x10331a944?}, 0x0)
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:258 +0xc4
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeValue(0x14000123ec8, {0x103946cc0?, 0x140002c3430?, 0x103915580?}, 0x0)
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:233 +0x500
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeMap(0x14000123ec8, {0x10395ea40?, 0x140002b97d0?, 0x140001ea8a0?}, 0x0)
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:284 +0x22c
github.com/amazon-ion/ion-go/ion.(*Encoder).encodeValue(0x14000123ec8, {0x10395ea40?, 0x140002b97d0?, 0x103319b38?}, 0x0)
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:239 +0x4dc
github.com/amazon-ion/ion-go/ion.(*Encoder).Encode(0x103aa6060?, {0x10395ea40?, 0x140002b97d0?})
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:177 +0x84
github.com/amazon-ion/ion-go/ion.MarshalBinary({0x10395ea40, 0x140002b97d0}, {0x0, 0x0, 0x0})
	/Volumes/workplace/jarviscollector/tmp/gomodcache/github.com/amazon-ion/[email protected]/ion/marshal.go:105 +0x74
golang.a2z.com/JarvisTracerExporter.TestDecimal(0x140002bed00)
	/Volumes/workplace/jarviscollector/src/JarvisTracerExporter/utils_test.go:305 +0xb4
testing.tRunner(0x140002bed00, 0x103a9ed68)
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/testing/testing.go:1690 +0xe4
created by testing.(*T).Run in goroutine 1
	/Users/wnste/brazil-pkg-cache/packages/GoLang/GoLang-1.x.338304.0/AL2_x86_64/DEV.STD.PTHREAD/build/lib/src/testing/testing.go:1743 +0x314

Ion decimal seems to be supported based on the docs I see and example test cases in the repo. Any ideas what I may be doing wrong?