getContent = () => {
							if (typeof source.buffer === "function") {
								return source.buffer();
							}
							const bufferOrString = source.source();
							if (Buffer.isBuffer(bufferOrString)) {
								return bufferOrString;
							}
							return Buffer.from(bufferOrString, "utf8");
						}
get the binary (Buffer) content from the Source
@returns {Buffer} content for the source