[pull] master from ruby:master - #1453
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Treat encoding coercion, `to_io`, and scheduler capability checks as callouts that can change the buffer before byte access begins. - Copy `get_string` bytes through the existing locked-for-reading helper after encoding coercion, without retaining metadata pointers across it. - Obtain the writable buffer after `to_io` conversion in `read` and `pread`. - Reacquire and validate the buffer before native I/O fallback when the scheduler does not handle `read`, `write`, `pread`, or `pwrite`. Add regression coverage using the existing buffer and slice APIs. Scheduler probes shrink a slice without freeing its underlying storage, making stale length handling observable without accessing released memory. Also cover encoding callbacks and frozen-state changes during I/O coercion. This is an independent correctness extraction from #18911. It introduces no new classes, slice representation, or public API.
…me origin Gem::RemoteFetcher and the Bundler downloader resent the header on every redirect, including one to another origin. It carries the source URI that Bundler replaces with a mirror, credentials included, so it is meant for the mirror's origin only, and RFC 9110 (Section 15.4) asks a client following a redirect to consider removing such fields. ruby/rubygems@f52afd1b92 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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