[whatwg/url] What is the correct value that should be passed for processing_option? (#400)

In the [domain to ASCII](https://url.spec.whatwg.org/#concept-domain-to-ascii) algorithm, it is explicitly stated that processing_option should be set to Nontransitional_Processing. However, the [domain to Unicode](https://url.spec.whatwg.org/#concept-domain-to-unicode) algorithm does not explicitly state whether Transitional or Nontransitional processing should be used. Am I correct to assume that Transitional processing should be used here?

> Let result be the result of running Unicode ToUnicode with domain\_name set to domain, CheckHyphens set to false, CheckBidi set to true, CheckJoiners set to true, and UseSTD3ASCIIRules set to false\.

The steps in [valid domain](https://url.spec.whatwg.org/#valid-domain) also don't explicitly state which processing_option should be used. Am I correct to assume that Transitional processing is also used here?
> Set result to the result of running Unicode ToUnicode with domain_name set to result, CheckHyphens set to false, CheckBidi set to true, CheckJoiners set to true, and UseSTD3ASCIIRules set to true.

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