Treating the marker of incomplete words as a word-internal character

[aarppe]

... the |-sign [which is added to the end of incomplete words as an indication of such] is treated as a word-separator, rather than as a part of the word (though the error-model deletes all |-signs before the end of a string, so something should be done about that ....
Originally posted by @aarppe in #10 (comment)

Generally, I've thought that the marker of incomplete words could alternatively be the tilde (~), as it is similar to a hyphen and not generally expected to occur in words. Or then one could make use of the hyphen (-) which already doubles as a separator of preverbs/prenouns and reduplicative elements, though that could be confusing to the end-users. In the case of the hyphen, one could either always add it at the end of incomplete words (e.g. ni- or nikî--) or append it to an incomplete word only when the correct version of the string would not end in some aforementioned prefix (e.g. ni- or nikî-).

Whichever character we will use, that should be treated as a word-internal character.

[aarppe]

Furthermore, selecting a suggestion that ends with a character marking an incomplete word should not be appended with a space character (as the word yet needs to be completed) (again, warranting a separate issue).

[aarppe]

Swapped marker for incomplete words to tilde ~, as that is more similar to but not the same as the hyphen, as a possible word-internal character. Nevertheless, we would need to specify whichever incomplete word marker as a word-internal character.