This reduces a decent amount of overhead in #13778.
r? @SimonSapin
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This will allow types to be generic over our local `ToCss`
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r? @SimonSapin
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In order to clamp them at computed value time.
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The bulk of this is adding cargo features to make derived implementations of `heapsize` and `serde` traits optional.
"Almost" because `std::intrinsics::discriminant_value` is currently unstable and doesn’t have any stable replacement that I know of. For now, this PR conditionally replaces it with `unimplemented!()`.
r? @nox
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Corey Farwell
Emilio Cobos Álvarez
Ravi Shankar
Simon Sapin
João Oliveira