JavaScript (Node.js), 108 bytes, Double Cracked

f=y=>(x=>{for(;typeof y=='string'&&x===x;);})(f['constructor'](`return +[${y.replace(/[^W-`*-0]/g,'')}]`)())

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Fixed a bug that allowed errors...

My intended solution was [][+[]]+[]][+[]. This evaluates to coercing undefined to an integer, which is NaN, and NaN !== NaN.