Every finding in a text, in order, with offsets into that text.
Words that begin with what is being typed, attested ones first.
Optionallimit: numberRule tests and the first moments of a session have no lexicon: rules that need one find nothing.
Spelling suggestions for one word, for a finding whose lookup asks for them.
Checks text paragraph by paragraph. Only a changed paragraph is checked again: an unchanged one takes its findings from the cache, moved to its new position.