public ByteVector putByte(final int b) {
		int length = this.length;
		if (length + 1 > data.length) {
			enlarge(1);
		}
		data[length++] = (byte) b;
		this.length = length;
		return this;
	}
Puts a byte into this byte vector. The byte vector is automatically enlarged
if necessary.

@param b a byte.
@return this byte vector.
src/main/java/com/alibaba/fastjson/asm/ByteVector.java