MAINT: Relax asserts to match relaxed reducelike resolution behaviour
MAINT: Relax asserts to match relaxed reducelike resolution behaviour

This closes gh-20751, which was due to the assert not being noticed
triggered (not sure why) during initial CI run.
The behaviour is relaxed, so the assert must also be relaxed.

rgommers/numpy,mhvk/numpy,pdebuyl/numpy,endolith/numpy,anntzer/numpy,numpy/numpy,rgommers/numpy,rgommers/numpy,seberg/numpy,jakirkham/numpy,mattip/numpy,mhvk/numpy,endolith/numpy,rgommers/numpy,seberg/numpy,pdebuyl/numpy,anntzer/numpy,seberg/numpy,jakirkham/numpy,mhvk/numpy,charris/numpy,mhvk/numpy,mattip/numpy,jakirkham/numpy,pdebuyl/numpy,numpy/numpy,anntzer/numpy,charris/numpy,numpy/numpy,jakirkham/numpy,anntzer/numpy,endolith/numpy,mhvk/numpy,mattip/numpy,numpy/numpy,charris/numpy,seberg/numpy,charris/numpy,mattip/numpy,pdebuyl/numpy,jakirkham/numpy,endolith/numpy