possibility is that sometime around 21.5.26 Ben fixed the position
cache that is used to translate byte indicies to char indicies and
vice versa. I don't know if the cache is present and/or working in
There is a cache in 21.4, but it later changed a lot.
The VM summary catastrophic slowness is present in 21.5.18, but not in
21.5.21 (19 and 20 both crash, so I couldn't try them).
Looking at the code, the cache code was considerably re-written beween
those versions. So was a lot of other stuff!
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