1606957 - Try to improve conversions from UTF8String to JS::Value

Status: NEW

(Core :: DOM: Bindings (WebIDL), task, P3)

Description

[Emilio Cobos Álvarez [:emilio]]

In bug 1449861, I am using JS_NewStringCopyUTF8N to convert an UTF-8 string to a JS value. This has some caveats:

• It walks the entire string in all cases to determine the "smallest encoding".
• It will trigger automatic non-sharing copies for non-ASCII cases.

We should try to do better, either by changing the string representation in SpiderMonkey (which I suspect is hard), or by trying to provide more information in the returned string (like whether we're ASCII or such).