When using the truncate function, the slug can be longer than MaxLength on specific conditions. See this example:

• original string (of length 11): "abcde-fghij"
• MaxLength: 10
• expected string: "abcde"
• output string: "abcde-fghij"

Current function fails on this edge case because the last word doesn't end with a "-" during the max length test here so the - 1 is wrongfully applied.