Is numeric ("-10")?
Is numeric (16)?
Is numeric (0xFF)?
Is numeric ("0xFF")?
Is numeric ("8e5")?
Is numeric (3.1415)?
Is numeric (+10)?
Is numeric (0144)?
Is numeric ("")?
Is numeric ({})?
Is numeric (NaN)?
Is numeric (null)?
Is numeric (true)?
Is numeric (Infinity)?
Is numeric (undefined)?