[pull] master from ruby:master#520

Merged

pull[bot] merged 7 commits intoturkdevops:masterfrom

Nov 29, 2025

Commits on Nov 28, 2025

[ruby/rubygems] Add `MAKEFLAGS=-j` by default before compiling:

authored and
matzbot
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nmake didn't support -j flag
hsbt
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[ruby/rubygems] Fixed checksums generation issue when no source is specified

hsbt
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matzbot
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[ruby/rubygems] Use String#include? with suggested by Performance/StringInclude cop

hsbt
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matzbot
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[ruby/rubygems] Restore `install` as default command

byroot
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matzbot
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[ruby/rubygems] Print help summary when the default command fail

byroot
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matzbot
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[ruby/rubygems] Add informational message when default_cli_command is unset.

hsbt
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matzbot
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