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fix: preserve legacy path bytes and repair tag, tree and ref edge cases #3095

Job	Run time
install/import (windows-latest, 3.8)	1m 1s
install/import (ubuntu-latest, 3.10)	11s
install/import (macos-latest, 3.8)	51s
test (ubuntu, 3.12)	4m 57s
install/import (ubuntu-latest, 3.9)	18s
install/import (ubuntu-latest, 3.8)	17s
install/import (macos-latest, 3.10)	37s
install/import (macos-latest, 3.9)	23s
install/import (windows-latest, 3.9)	1m 6s
test (macos, 3.13)	13m 0s
test (ubuntu, 3.13)	5m 10s
test (ubuntu, 3.11)	4m 35s
test (windows, 3.15t)	27m 59s
test (macos, 3.14)	12m 40s
test (ubuntu, 3.15t)	4m 49s
install/import (windows-latest, 3.10)	1m 5s
test (windows, 3.14t)	38m 26s
test (ubuntu, 3.14)	4m 21s
test (ubuntu, 3.14t)	4m 39s
test (macos, 3.12, gix)	8m 22s
test (macos, 3.11)	12m 34s
test (windows, 3.11)	57m 39s
test (windows, 3.15)	36m 34s
test (ubuntu, 3.15)	4m 38s
test (macos, 3.12)	11m 31s
test (windows, 3.13)	50m 31s
test (macos, 3.15)	12m 33s
test (windows, 3.12, gix)	32m 42s
test (windows, 3.12)	53m 31s
test (ubuntu, 3.12, gix)	3m 39s
test (windows, 3.14)	38m 59s
	7h 29m 38s