Some corner cases tested with str-{starts,ends}with
Review corner cases in str-find in Lush2.
UPCASE1 does not depend on the initial spaces.
PARSE-NUMBER and STR-VAL did not parse number beginning with 0 properly
STR should signal an error when the argument is not a real number.
STR-FIND should not complain if the position argument is too small
CHR should error when the value is not real, or out of range