2.1.2 [ECMA-402/4] Section 11.1.2 InitializeNumberFormat ( numberFormat, locales, options )

V0120: Currency code CLF is not supported

The specification states:

 11.1.2 InitializeNumberFormat ( numberFormat, locales, options )
  
     The abstract operation InitializeNumberFormat accepts the arguments numberFormat 
     (which must be an object), locales, and options. It initializes numberFormat as a 
     NumberFormat object. The following steps are taken: 
  
         ...
         Let ... be ? GetOption(options, "currency", "string", undefined, undefined).
         ...
              a. If the result of IsWellFormedCurrencyCode(…) is false, throw a RangeError 
              exception.
         ...
         ... Return numberFormat.

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Currency code CLF is not supported.