Allow enum variants up to 512 bytes

clippy warns if one of the variants of an enum is significantly larger
than the others, as that can cause surprising memory use: an enum uses
as much space as its largest variant. We have some such enums, but
changing them to have variants of similar size would change the API so
I've chosen to allow variants up to 512 bytes.

Found by clippy lint large_enum_variant:
https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant

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