zstd is only supported for binary packages, not source packages: is this intentional?

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Hi,
I noticed an inconsistency that feels weird to me. Support for zstd was add=
ed to dpkg-deb for binary packages at https://git.dpkg.org/cgit/dpkg/dpkg.g=
it/diff/src/deb/main.c?id=3D2c2f7066bd8c3209762762fa6905fa567b08ca5a
You'll note there that the names of the supported compression algorithms is=
 baked into the parsing logic and help text for -Z (--compression), but thi=
s seems like duplication of code. At https://git.dpkg.org/cgit/dpkg/dpkg.gi=
t/tree/lib/dpkg/compress.c#n1345 is an array of all compression algorithms =
known to dpkg with metainformation like the user-presentable names, so it w=
ould seem this could be used for the command-line option and help text code=
.

Other commands didn't have support for zstd added, and because they don't u=
se that central roster of compression methods, they've been allowed to fall=
 out of sync. In particular dpkg-buildpackage says for -Z "Passed unchanged=
 to dpkg-source. See its manual page." and dpkg-source does not have the zs=
td support, as it wasn't added when the support for dpkg-deb was; dpkg-sour=
ce -Zzstd simply fails saying the algorithm is unknown.

The disparity is a little weird. Shouldn't zstd be allowed for source packa=
ges if dpkg is already carrying the same support for binary packages anyway=
?

Thanks,
John

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