Crystal 1.5.1 released!

[NewsBot]

Crystal 1.5.1 has been released.

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](https://g…

Link: https://github.com/crystal-lang/crystal/releases/tag/1.5.1

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