fix(js/ts/python): support explicit constructors with as and then - #5235

fix(js/ts/python): support explicit constructors with as and then#5235

MangelMaxime merged 16 commits into

mainfable-compiler/Fable:mainfrom

fix/explicit-ctor-as-selffable-compiler/Fable:fix/explicit-ctor-as-selfCopy head branch name to clipboard