DecimalFormat uses DigitList.append for parsing routines.

During the append process:

An int from range 0 to 9 is converted to a char of '0' to '9'. This char is then converted to a byte (the code points 48 - 57).

Explicitly it is int -> char -> byte.

This could be simplified (explicitly) to int -> byte w/o the need for the intermediate cast to char.