0.555

Analysis changes

• Type mismatch errors now mention if unification failed in covariant or invariant context, to explain why sometimes derived class can't be converted to base class or why T can't be converted into T? and so on
• Class type indexing is no longer an error in non-strict mode (still an error in strict mode)
• Fixed cyclic type packs not being displayed in the type
• Added an error when unrelated types are compared with ==/~=
• Fixed false positive errors involving sub-type tests with a never type

Runtime changes

• Fixed miscompilation of multiple assignment statements (Fixes #754)

Community contributions

• Handle cyclically referenced declared classes by @JohnnyMorganz in #729
• Support __call on class type vars by @JohnnyMorganz in #762