Benchmark: Check if char is number

Tests:

Number.isNaN + parseInt
Number.isNaN(parseInt("a")); Number.isNaN(parseInt("1"));
String includes
"0123456789".includes("a"); "0123456789".includes("1");
Number.isNaN + casting
Number.isNaN(- -("a")); Number.isNaN(- -("1"));
Equality + casting
-1 < (- -("a")); -1 < (- -("1"));
Regex
/\d/.test("a"); /\d/.test("1");

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Related benchmarks:

Check if char is number (version: 0)