# Functions
New returns a new Lookup instance.
NewMemoryIDCache returns a new MemoryIDCache.
Pathify segments the beginning of a string into depth segments of width length Pathify("aabbccdd", 3, 1) will return "a/a/b/bccdd".
# Structs
Lookup implements transformations from filepath to node and back.
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# Interfaces
IDCache is a cache for node ids.