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fix: preserve legacy path bytes and repair tag, tree and ref edge cases #3102

Job	Run time
install/import (ubuntu-latest, 3.10)	8s
install/import (ubuntu-24.04, 3.8)	17s
test (ubuntu, 3.13)	5m 8s
install/import (windows-latest, 3.10)	1m 10s
install/import (macos-latest, 3.10)	27s
install/import (macos-latest, 3.9)	30s
install/import (ubuntu-24.04, 3.9)	20s
install/import (macos-latest, 3.8)	55s
install/import (windows-latest, 3.8)	1m 2s
install/import (windows-latest, 3.9)	1m 5s
test (ubuntu, 3.11)	4m 52s
test (ubuntu, 3.15)	4m 10s
test (windows, 3.14)	31m 35s
test (windows, 3.13)	54m 32s
test (windows, 3.12)	49m 20s
test (ubuntu, 3.12, gix)	5m 5s
test (macos, 3.11)	14m 44s
test (windows, 3.15)	41m 14s
test (windows, 3.11)	55m 1s
test (macos, 3.12, gix)	7m 7s
test (ubuntu, 3.14)	4m 16s
test (macos, 3.15)	15m 40s
test (macos, 3.13)	12m 38s
test (ubuntu, 3.14t)	4m 10s
test (macos, 3.14)	13m 40s
test (windows, 3.14t)	38m 32s
test (windows, 3.15t)	42m 12s
test (ubuntu, 3.12)	5m 47s
test (macos, 3.12)	17m 22s
test (ubuntu, 3.15t)	4m 36s
test (windows, 3.12, gix)	35m 15s
	7h 52m 50s