domain("foo.ba_r") returned True, and domain("example.co_uk") did too. hostname("foo.ba_r") and email("a@foo.ba_r") did too.
An underscore is allowed in a service label when rfc_2782 is set. example_.com and _sip._tcp.example.com still need that flag, and they still pass with it. The last label allowed _ either way. example.com, xn----gtbspbbmkef.xn--p1ai, and a.co still pass.
The last label allowed "_" with or without rfc_2782, so foo.ba_r validated.
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domain("foo.ba_r") returned True, and domain("example.co_uk") did too. hostname("foo.ba_r") and email("a@foo.ba_r") did too.
An underscore is allowed in a service label when rfc_2782 is set. example_.com and _sip._tcp.example.com still need that flag, and they still pass with it. The last label allowed _ either way. example.com, xn----gtbspbbmkef.xn--p1ai, and a.co still pass.
Fixes #484.
Test plan