fix(ts): type narrowing in forOfAttrTag function

[LuLaValva]

Previously, type expansion broke this type:

<my-tag>
  <@foo size="small"/>
  <@foo size="large"/>
</my-tag>

// my-tag.marko
export interface Input {
  foo: Marko.AttrTag<{
    size: "small" | "large"
  }>;
}

because instead of "small" | "large", the type lost its specificity and propagated as string.

This const prevents working code from throwing type errors, but it doesn't fix the long-winded error that it shown in addition to the very precise error when an invalid type is included (see snapshot examples). We should look into a way to filter out the big error when we know the small and direct one will exist.

[changeset-bot]

🦋 Changeset detected

Latest commit: bb612d9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@marko/language-server	Patch
@marko/language-tools	Patch
@marko/type-check	Patch
marko-vscode	Patch

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