src/main/java/com/nurkiewicz/lazyseq/LazySeq.java
public String mkString(String start, String sep, String end) {
		return mkString(start, sep, end, false);
	}
public String mkString(String start, String sep, String end) {
		return mkString(start, sep, end, false);
	}
Returns a string representation of this {@link LazySeq}.
The string result starts with the string <code>start</code> and ends with <code>end</code>,
whereas <code>sep</code> is as separator string between the elements of this sequence.