Memory map as private pure copy. (#553) #148

Job	Run time
macos (macos-13, x86_64)	35s
musllinux (ubuntu-latest, x86_64)	40s
macos (macos-14, aarch64)	22s
windows (windows-latest, x64)	2m 7s
musllinux (ubuntu-latest, x86)	39s
windows (windows-latest, x86)	2m 32s
musllinux (ubuntu-latest, aarch64)	52s
musllinux (ubuntu-latest, armv7)	51s
linux (ubuntu-latest, x86_64)	52s
linux (ubuntu-latest, x86)	1m 1s
linux (ubuntu-latest, aarch64)	1m 32s
linux (ubuntu-latest, armv7)	1m 24s
linux (ubuntu-latest, s390x)	1m 18s
linux (ubuntu-latest, ppc64le)	1m 16s
sdist	9s
Release	0s
	16m 10s

Provide feedback