Small Proposal "!in"

[Tobias Buschor]

 I dont like to write:
if ( !('x' in obj) &&  !('y' in obj) ) {
     doit()
}

I was even tempted to write it that way:
if ('x' in obj  ||  'y' in obj) { } else {
     doit()
}

What about a !in operator to write it like this?
if ('x' !in obj  &&  'y' !in obj) {
     doit()
}
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