Attempt to explain better why delImplIdx is the way it is.  Maybe this can (#15108)
Attempt to explain better why delImplIdx is the way it is.  Maybe this can (#15108)

avoid future implementation mischief.  (Maybe not.  Sometimes, general
distrust of theory leads people to distrust simple reasoning over times
from CPUs trying as hard as possible to mask DRAM latency via pre-fetch.)
dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim