jodd-core/src/main/java/jodd/buffer/FastCharBuffer.java
@Override
	public FastCharBuffer append(final char element) {
		if (offset - buffer.length >= 0) {
			grow(offset);
		}

		buffer[offset++] = element;
		return this;
	}
@Override
	public FastCharBuffer append(final char element) {
		if (offset - buffer.length >= 0) {
			grow(offset);
		}

		buffer[offset++] = element;
		return this;
	}
Appends single {@code char} to buffer.