add priority to map

src/Observables.jl

@@ -509,12 +509,12 @@ Observable{Number}(1.7320508075688772)
 
 can handle any number type for which `sqrt` is defined.
 """
-@inline function Base.map!(@nospecialize(f), result::AbstractObservable, os...; update::Bool=true)
+@inline function Base.map!(@nospecialize(f), result::AbstractObservable, os...; update::Bool=true, priority = 0)
  # note: the @inline prevents de-specialization due to the splatting
  callback = MapCallback(f, result, os)
  # appendinputs!(result, obsfuncs)
  for o in os
- o isa AbstractObservable && on(callback, o)
+ o isa AbstractObservable && on(callback, o, priority = priority)
  end
  update && callback(nothing)
  return result
@@ -559,10 +559,10 @@ julia> map(length, obs)
 Observable(3)
 ```
 """
-@inline function Base.map(f::F, arg1::AbstractObservable, args...; ignore_equal_values=false) where F
+@inline function Base.map(f::F, arg1::AbstractObservable, args...; ignore_equal_values=false, priority = 0) where F
  # note: the @inline prevents de-specialization due to the splatting
  obs = Observable(f(arg1[], map(to_value, args)...); ignore_equal_values=ignore_equal_values)
- map!(f, obs, arg1, args...; update=false)
+ map!(f, obs, arg1, args...; update=false, priority = priority)
  return obs
 end