static Lifespan since(long snap) {
		return new Impl(0, snap);
	}
Get the lifespan from 0 to the given snap.

<p>
The lower bound is 0 to exclude scratch space.

@param snap the snapshot key
@return the lifespan
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/model/Lifespan.java