private void initializeCache(double factorArg) {
		// See notes about factor where the value is used.
		this.factor = factorArg;
		symbolCache = new HashMap<>();
	}
Returns the symbol at the offset of the stream
@param streamNumber the stream
@param offset the stream offset
@return the PDB symbol
@throws PdbException upon moduleNumber out of range or no module information
@throws CancelledException upon user cancellation
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/SymbolRecords.java