A null value in a property of the options arguments in the ECMAScript 
Internationalization API is currently special-cased and treated as if it were 
undefined, leading to default values to be applied. This probably crept in 
based on examples in some libraries that treat any falsy value in options 
properties like undefined.

The API expects booleans, strings, and numbers in these properties, not objects 
(although objects will be coerced to the expected types). It seems best 
practice is to use null only where objects are expected, so it shouldn't be 
used here.

I'd like to remove the special case handling, that is, delete "or null" from 
steps 2 of sections 9.2.9 and 9.2.10 of the spec. Coercion would be applied 
instead depending on the expected type:
- String: coerced to "null", which will result in RangeError exceptions being 
thrown.
- Boolean: coerced to false.
- Number: coerced to +0, which may result in RangeError exceptions being thrown.

Any objections?

Thanks,
Norbert

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