- The type list for function declarations does not accept defaults, but
the grammar incorrectly allowed this.
- Allow the empty table type `{}`
- Allow composite types and types surrounded by parentheses (e.g.
`string??`, `(string)`, `(string | number) & boolean`)
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Co-authored-by: vegorov-rbx <75688451+vegorov-rbx@users.noreply.github.com>
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