1.5.1

Standard Library

• Fix Class#nilable? for recursive unions and root types (#12353, thanks @HertzDevil)

Numeric

• Fix Float#abs and Number#format for -0.0 (#12424, thanks @straight-shoota)

Text

• Fix null dereference when passing empty slice to Base64.encode (#12377, thanks @dscottboggs)

Compiler

• Do not check abstract def parameter names on abstract types and modules (#12434, thanks @HertzDevil)

Codegen

• Compiler/codegen: reset @needs_value (#12444, thanks @asterite)
• Fix homogeneous_aggregate? check for aarch64 types (#12445, thanks @mattrberry)

Semantic

• Compiler: don't eagerly check cast type (#12272, thanks @asterite)
• Fix type restriction augmenter for Union(*T) and similar (#12438, thanks @asterite)

Tools

Formatter

• Formatter: Fix assign followed by comment (#12319, thanks @straight-shoota)
• Handle formatting annotated method parameters (#12446, thanks @Blacksmoke16)

Other

• Update distribution-scripts (#12359, thanks @straight-shoota)
• Update distribution-scripts (#12333, thanks @straight-shoota)
• [CI] Bumping xcode to 13.4.1 (#12264, thanks @beta-ziliani)