186191 2018-06-01 05:16:10 -0700 Consider MasqueradesAsUndefinedObjectType 2018-06-01 05:16:34 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 ysuzuki webkit-unassigned fpizlo keith_miller mark.lam saam ysuzuki oldest_to_newest 1429192 0 ysuzuki 2018-06-01 05:16:10 -0700 MasqueradesAsUndefined is crazy feature, 1. It is introduced for backward compatibility of `if (document.all)` thingy. It is unlikely that MasqueradesAsUndefined objects increases 2. MasqueradesAsUndefined is only used for HTMLAllCollection right now 3. HTMLAllCollection is ObjectType So, what do we think of folding this information into JSType, and free up MasqueradesAsUndefined TypeInfo flag space? We can introduce MasqueradesAsUndefinedObjectType for HTMLAllCollection.