writeU8 method
Encodes an unsigned 8-bit integer (0-255)
Example:
encoder.writeU8(255);
Implementation
void writeU8(int value) {
if (value < 0 || value > 0xFF) {
throw ArgumentError.value(value, 'value', 'Must be 0-255 for u8');
}
_buffer.addByte(value);
}