1096753 - Array.isArray(new Proxy([], {})) should be false

Status: RESOLVED DUPLICATE of bug 1111785

(Core :: JavaScript: Standard Library, defect)

Description

[Jeff Walden [:Waldo]]

ScriptedDirectProxyHandler needs an objectClassIs trap to fix this.  (It actually needs one to handle revoked proxies correctly, independent of this issue.)

Comment 1

[Mike Hoye [:mhoye]]

Jeff: A DXR link and and a general outline of the fix turns this in to a great first bug.

Comment 2

[Tom Van Cutsem]

Relevant discussion thread on es-discuss: <https://esdiscuss.org/topic/array-isarray-new-proxy-should-be-false-bug-1096753>

Comment 3

[Brendan Eich [:brendan]]

This bug should await TC39 discussing the spec issue next week.

/be

Comment 4

[Jeff Walden [:Waldo]]

es-discuss went ahead and made this into a more full-blown thing with property-gets, a canonical symbol, and a bit more.  It's all rather more than seems to fit a mentored bug, at this point.  (Tho it'd work fine for someone half a dozen patches into SpiderMonkey development, far enough to have a sense of SpiderMonkey idioms and such.)