simplify loaderIsVerified

[iambumblehead]

per review #231 (comment)

[iambumblehead]

the original suggestion is

let loaderIsVerifiedCache;
const loaderIsVerified = async () =>
  (loaderIsVerifiedCache ??= (await import(importUrl)).default === true);

and here is what is in the PR

const loaderIsVerified = (memo => async () => memo = memo || (
  (await import(loaderVerifyUrl)).default === true))()

I prefer the latter-version in the PR currently, but am flexible and fine with the suggested version as well

[koshic]

Looks good for me, thank you! What about 'dedicated variable vs parameter reusing' - if it's your preferred style, let's keep it. I have more than enough possibilities to promote 'my style' (which is suitable for large projects) via linter rules on my current job )

[iambumblehead]

I like both. I slightly prefer the function version to encapsulate everything needed inside the same function