serge-sans-paille efc472b57d Bug 1886479 - Introduce the possibility to provide a fallback in python site r=mach-reviewers,ahal ... pyyaml is already vendored but as a consequence we don't benefit from the faster native loader. Introduce the possibility to provide a vendored package as fallback to an optional pypi package. If the pypi package install fails, we can still use the vendored one without the speed benefit. This makes my `mach build export` step 8% faster. Differential Revision: https://phabricator.services.mozilla.com/D234652		2025-01-21 08:13:39 +00:00
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