go-pkgz / syncs / 32208597699

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Update dependencies, run go fix and support errors.Is on MultiError (#15)

* Update dependencies and CI actions

Bump testify to v1.12.0 and move the workflow to checkout@v7, setup-go@v7
and golangci-lint-action@v9. Push branch and tag filters spelled out as
"**" to keep actionlint happy.

* Run go fix

Modernizers replace the counted loops with range-over-int, available
since go 1.22. The per-iteration loop variable copies are not needed
since the same version either.

* Make goroutine count assertions relative to the test baseline

Previously the preemptive and discard tests compared runtime.NumGoroutine
against absolute numbers, which counts goroutines left over from the
earlier tests and failed at random. The limit is now relative to the count
taken at the start of the test, and the concurrency the options promise is
checked directly by tracking how many functions run at once.

* Support errors.Is and errors.As on MultiError

MultiError implements Unwrap() []error, so the error returned by Wait
matches any of the collected errors, the same way errors.Join behaves.
Errors returns a copy of the collected slice, as the caller shouldn't be
able to change the content of the error.

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