JavaScript sources hold node:util's MIMEType and MIMEParams as identity
tokens, so a read such as MIMEType.prototype or MIMEType.name answered
undefined where Node returns the class's member. Those reads now report
SC2020, as the TypeScript spelling does at compile time; in JavaScript
the refusal throws when the read runs.
The node24-mime-errors fixture reads MIMEType.prototype to take the
getters' descriptors, so its expected refusal is now SC2020.
Chris Tate
a96fbcfb64