encodeLowercase
DEFAULT: false
If true, lowercase characters from table Crockford.CHARS_LOWER will be output during encoding operations. This is non-compliant with the Crockford spec.
If false, uppercase characters from table Crockford.CHARS_UPPER will be output during encoding operations.
NOTE: This does not affect decoding operations. Crockford is designed to accept characters from both tables when decoding (as specified in the Crockford spec).