id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
742	perform immediateness checks inline before calling C_mutate	felix winkelmann	felix winkelmann	"By doing this an out-of-line function call may be avoided which could speed up code doing an excessive number of mutations or doing many mutations on the same storage location.

There is also a patch by Joerg Wittenberger (attached) which does inline the test whether the assigned value is in the nursery (I'm not completely sure about this patch - for some irrational reason I don't trust `C_in_stackp`).
"	enhancement	closed	not urgent at all		core libraries	4.7.x	fixed	runtime mutation C_mutate