Allow invoking lib call without obj inside lib. Part of #311
lib fun call is not supported in dispatch. Fixes #311
Fixed #283: Allow `enum Foo::Bar`
Small refactor
Added Float#nan?, Float#infinite? and Float#finite?. Fixed #269
Make `"#{value}"` parse as an interpolation, not as `value.to_s`. Fixes #259 (fixes the small inconsistency).