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This commit adds support for bitcode Encode and Decode. It does so gated behind a feature flag. The bitcode version is set to 0, with default features turned off, only derive feature added, and optional set to true. This allows libraries to specify the verison of bitcode they would prefer, and avoids using any other functionality of bitcode.

This commit adds support for bitcode Encode and Decode. It does so gated
behind a feature flag. The bitcode version is set to 0, with default
features turned off, only derive feature added, and optional set to
true. This allows libraries to specify the verison of bitcode they would
prefer, and avoids using any other functionality of bitcode.
uuid = { version = "1.1", optional = true }
postgres-types = { version = "0.2.6", optional = true }
bytes = { version = "1.4.0", optional = true }
bitcode = { version = "0", features = ["derive"], default-features = false, optional = true }
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This should specify the minor version for major=0 versions.

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Specifying version = "0" allows the user to pick the major version of bitcode. Since ulid has reached version 1, it can't make breaking changes to update bitcode. For example if ulid added support for bitcode = "0.6" and bitcode = "0.7" was released, ulid couldn't update to it because that would be a breaking change.

bitcode = "0" allows any version the user wants to pick such as 0.5, 0.6 and future 0.7. The only tricky part is making sure ulid doesn't use APIs that will break between major versions. Luckily, bitcode docs specify that #[derive(bitcode::Encode, bitcode::Decode)] and feature = "derive" won't ever change between major versions.

While this method is unconventional, it allows 3rd party crates to support bitcode while allowing bitcode to remain unstable. One of bitcode's core goals is to keep improving its binary format. Unfortunately format changes are breaking changes so bitcode can't ever reach 1.0.

[dev-dependencies]
bencher = "0.1"
serde_derive = "1.0"
bitcode = "0.5"
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This is extra, remove.

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@PrismaPhonic hi, thank you for your amazing pr! Would you be able to update this pull request (PR) when you have time?

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4 participants