20458 2012-12-20 09:24:09 +0000 4.2.22: converting IDL value to IDL type? 2014-01-27 17:01:24 +0000 1 1 1 Unclassified WebAppsWG WebIDL unspecified All All RESOLVED FIXED [v1] P2 normal --- 1 jmdyck cam mike public-script-coord public-webapps-bugzilla oldest_to_newest 80433 0 jmdyck 2012-12-20 09:24:09 +0000 In "4.2.22. Nullable types -- T?", in the IDL->ECMAscript conversion, the second bullet says: Otherwise, the ECMAScript value is the result of converting the IDL nullable type value to the inner IDL type T. which incorrectly implies that you can get an ECMAScript value when you convert an IDL value to an IDL type. I think you need to change: to the inner IDL type T to: using the rules for the inner IDL type T Or perhaps change the whole bullet to something like: Otherwise, the IDL value must be a value of the nullable type's inner type T. The ECMAScript value is the result of converting the IDL value using the rules for T. 99165 1 cam 2014-01-27 17:01:24 +0000 Thanks, the "using the rules for" wording is good. https://github.com/heycam/webidl/commit/848b0c60effcf585f442a7899ba958b05c833929