Media files corrupted during packaging

[jfedor2]

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Description

If you look at the files inside the latest release tarball (blockly-11.2.0.tgz), the binaries in the media/ directory are different than the ones in the repository. Looking closer, they have a lot of EF BF BD byte sequences where they shouldn't, which is the UTF-8 representation of Unicode 'REPLACEMENT CHARACTER' (U+FFFD), suggesting that something is interpreting the binaries as Unicode, which obviously isn't right for MP3s etc.

Indeed that's what gulp's src() is doing unless you pass the encoding: false option (it was a breaking change in version 5.0.0).

Reproduction steps

1. npm run package
2. diff media/click.mp3 dist/media/click.mp3

Stack trace

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