markers: add special handling for extra
#636
Merged
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extra
is not like any other marker, it is, well, "extra". Whereas normal markers can only have one value at a time,extra
can have multiple values at the same time.For example, a marker like
sys_platform == "win32" and sys_platform == "linux"
can never be fulfilled becausesys_platform
can only be either"win32"
or"linux"
(not both). By contrast, a marker likeextra == "a" and extra == "b"
can be fulfilled if both extras are requested.Therefore, this PR disables some simplifications for
extra
markers. Further, it adds the option to validate environments with multiple extras and makes the validation robust against unnormalized names.