@Override
	public boolean replaceValue(ByteBlock block, BigInteger index, int charPosition, char c) {
		return false;
	}
Overwrite a value in a ByteBlock.
@param block block to change
@param index byte index into the block
@param pos The position within the unit where c will be the
new character.
@param c new character to put at pos param
@return true if the replacement is legal, false if the
replacement value would not make sense for this format, e.g.
attempt to put a 'z' in a hex unit.
block
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/format/AddressFormatModel.java