Function keysToNumbers

Returns a copy of object with integer numbers as keys instead of whatever it has.

keysToNumbers({ '1': true }); // Yields: { 1: true }
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The onInvalidKey sets how to handle keys that cannot be converted to integers.

• 'throw' (default): throws an exception
• 'ignore': that key & value is ignored
• 'keep': uses the string key instead

keysToNumber({ hello: 'there' }, `ignore`); // Yields: {  }
keysToNumber({ hello: 'there' }, `throw`);  // Exception
keysToNumber({ hello: 'there' }, `keep`);   // Yields: { hello: 'there' }
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Floating-point numbers will be converted to integer by rounding.

keysToNumbers({ '2.4': 'hello' }); // Yields: { 2: 'hello' }
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