"sized structures", per https://youtu.be/VAGNcyo8hqs?si=Mt5gWGp1u-NKsKyp, ~10m40s

[bch]

What do you want to change?

Per private email w @mitchellh , consider using not a record of bytesize to differentiate structures, but monotonically increasing version or epoch. Can be expressed as enum for visual effect.

enum struct_foo_version {
FOO_V_1,
FOO_V_2,
[...],
FOO_V_LAST /** not used */
};

w/ or w/o typedef, as per style.

struct foo {
enum struct_foo_version version;
[...]
};

Why do you want to make this change?

ABI management/compatibility.

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