Resolve ambiguity of .IndexOfOrNone extension method
#855
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Currently using
IndexOfOrNoneon a concrete immutable collection such asImmutableArrayorImmutableListresults in an ambiguous overload error.This was not directly fixable using
[OverloadResolutionPriority]since the conflicting extension methods are in two different classes.I moved the immutable list overloads to
ListExtensionsbut kept the old methods around to avoid a binary breaking change. I only removed thethismodifier (which is not a binary breaking change, see #346)This PR is probably best reviewed on a per-commit basis :)