echo
----
# 	      a     b     c     d
# t=4000  [-----v1----)
# t=2000  [-v2-)[-----v3----)
#
# ac-valid-full
lookup(["a","c") @ 4000) = v1
# ac-valid-partial
lookup(["a\x00","b") @ 4000) = v1
# ac-incompatible-fragments
lookup(["a","c") @ 2000) = value change at "b" in expected range deletion ["a","c")
# ac-ts-too-early
lookup(["a","b") @ 2000) = v2
# ac-invalid-pre
lookup([/Min,"c") @ 4000) = gap [/Min,"a") in expected range deletion [/Min,"c")
# ac-invalid-post
lookup(["a","d") @ 4000) = gap ["c",...) in expected range deletion ["a","d")
# cd-invalid-post
lookup(["c","f") @ 2000) = gap ["d",...) in expected range deletion ["c","f")
