skip disables skipper inside argument - How to disable only outer skipper

[Flamefire]

skip[a] is documented as "Re-establish the skipper that got inhibited by lexeme or no_skip. "

It is underspecified if that applies to the outer and/or inner skipper.

Take this example: x3::lexeme[XXX >> x3::skip[YYY] ];

Is skip supposed to affect YYY, XXX >> YYY or both if XXX and YYY can contain skippers too?

What what the parser look like to join 2 parsers that might allow spaces inside without any space?

Example from Slack: https://godbolt.org/z/GYYejjrEd

auto const identifier = x3::lexeme[+x3::alpha];
auto const expr = identifier >> "=" >> identifier; 

auto const grammar = x3::lexeme[identifier >> '.' >> x3::skip[expr] ];