make allow-prereleases
a tri-state setting to really forbid pre-releases if the setting is false
and keep default behavior to allow pre-releases only if necessary
#783
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Values of
allow-prereleases
:false
: do not allow pre-release versions even if this means there is no solutiontrue
: do not distinguish between stable and pre-release versionsThis PR only allows
None
as a value / makes sure that the value of the property isNone
if not set (instead ofFalse
). The behavior is implemented downstream in python-poetry/poetry#9798.