Add FromCollection/ToCollection instances for Collection#117
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Add FromCollection/ToCollection instances for Collection#117
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Defined as id, these reflexive instances let polymorphic functions written against FromCollection a or ToCollection a accept a Collection directly without an extra wrapper or coercion at the call site. Closes #32
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Summary
Collectionnow hasFromCollection/ToCollectioninstances (bothid),so polymorphic functions written against either class accept a
Collectiondirectly with no wrapper or coercion at the call site.
Closes #32.
Verification
build/test validation. The change adds two non-orphan reflexive instances
in the same module as the class definitions and the type, so it cannot
collide with downstream instances.