| If length is given and is positive, the string returned will contain at most length characters beginning from start (depending on the length of string). If string is less than start characters long, FALSE will be returned.
If length is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes a position beyond this truncation, an empty string will be returned.
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