public String toString(Function<? super N, String> nToString) {
			return spanTree.values()
					.stream()
					.map(e -> domain.toString(e.getKey(), nToString) + '=' + e.getValue())
					.collect(Collectors.joining(",", "{", "}"));
		}
Create a span map on the given domain

<p>
Extensions should invoke this as a super constructor with a fixed domain. See
{@link DefaultULongSpanMap} for an example.

@param domain the domain
Ghidra/Framework/Emulation/src/main/java/generic/Span.java