- on a string or url field that is not numeric or integer, min and max
compare utf8.RuneCountInString (Laravel's mb_strlen) and answer with
the lagoon::validation min.string / max.string messages
- a min or max argument that is not a whole number is the
unrecognized-rule error, whatever the value
- rule strings without string or url keep their results (pinned by a
test); between is unchanged