Improvements to the hash function and expand/shrink logic in ObjIdMap.
Improvements to the hash function and expand/shrink logic in ObjIdMap.

permazen/permazen,archiecobbs/jsimpledb,archiecobbs/jsimpledb,gmsconstantino/jsimpledb,permazen/permazen,mmayorivera/jsimpledb,mmayorivera/jsimpledb,tempbottle/jsimpledb,permazen/permazen,gmsconstantino/jsimpledb,tempbottle/jsimpledb,gmsconstantino/jsimpledb,tempbottle/jsimpledb,archiecobbs/jsimpledb,mmayorivera/jsimpledb