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tree: preserve routed isometry metadata #241

Job	Run time
typecheck	33s
package	43s
test (3.12, extended, dev,test-extended)	2m 3s
test (3.10, core, dev)	36s
test (3.11, core, dev)	35s
test (3.12, vmc, dev,vmc)	1m 46s
test (3.12, core, dev)	38s
	6m 54s