go/pkg/cas/upload.go (2 lines):
	- line 427: seenDigests  sync.Map // TODO: consider making it more global
	- line 813: // TODO: detect cycles by symlink if needs to follow symlinks in this case.


go/pkg/digest/digest.go (1 line):
	- line 47: // TODO: replace this line after all clients support Go 1.15 where .String() is defined: