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Returns a NumberFormat for formatting and parsing percentage values for the user's default locale. See "Be wary of the default locale".
The NumberFormat returned by this method should only be used to format floating-point numbers typically between 0 and 1 (with 1 being 100%). A value such as 0.53 will be treated as 53%, but 53.0 (or the integer 53) will be treated as 5,300%, which is rarely what you intended.