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This implies that we remove [#] from consideration, as desired.
This means fewer facts are considered and a little time is saved.
Also, announced (in comments and assertions) that [any] is implemented as [#],
but not yet committed.

This may save some speed (not always, though)
and leads to storing much fewer facts in [T] (which saves memory).

all transitions and reductions on [error]. This leads to smaller
stars (if the grammar uses [error]), hence faster run time.

size (6311, which means 8192) to a variable size, determined by the
size of the alphabet and the star size of the state. This seems to
lead to slightly slower behavior on small grammars and to slightly
faster running times and lower memory consumption on large grammars.

The speed gain is quite clear, but depends on the initial size of the hash
tables.

Will probably try other approaches soon.

This makes almost no difference: it saves 5 nodes out of 25K in
the stars, and saves 10K facts out of 7M facts (on ocaml.mly --lalr).

Not essential. Perfectionism, I suppose.

No speed gain, but this allows removing [MyMap].