Compound `if` expressions appear to be resolved backwards when checking dict contents

[bigfootjon]

Describe the Bug

See the sandbox, pyrefly is inferring a type as a literal when the if statement checks the exact opposite of that.

Note that removing the not does nothing which suggests that the not is not being considered when specializing the type

Sandbox Link

https://pyrefly.org/sandbox/?code=GYJw9gtgBALgngBwJYDsDmUkQWEMoCGAzkQKZ4D68CpAULcGGAFxQAmSAxjANpEwgANFH4gAulAC8UAN4BfekmBQARIzArMKKOsIo2OpjzVMVEpESgow+FcRXNaUZ1ABuBADZTDYY+rNOLsRklNSkABTuHsKiAJRAA

(Only applicable for extension issues) IDE Information

No response

[yangdanny97]

Interesting, I think strings are supposed to be compared by equality instead of is, but != and is not both behave incorrectly here. Thanks for flagging.