cubicweb #6978316 sql cache bug on datetime with tzinfo [validation pending]

when a query has datetime with tzinfo as argument, the first value used is cached and get used afterward, overriding new values given as argument.

priorityimportant
typebug
done in3.21.2
load2.000
load left0.000
closed by#cfded6d0da11 fix bad-caching of datetime with tz info at sql generation time
patchfix bad-caching of datetime with tz info at sql generation time [applied]