Incorrect `extends` result with `string` and literals or `keyof SomeClass`

[justarandomgeek]

---@class SomeClass
---@field foo boolean

---@type "foo" extends string and true or false
local foostring -- is false, should be true
---@type "bar" extends string and true or false
local barstring -- is false, should be true
---@type "foo" extends keyof SomeClass and true or false
local fookey -- is true, fine
---@type "bar" extends keyof SomeClass and true or false
local barkey -- is false, fine
---@type string extends keyof SomeClass and true or false
local somestring -- is true, should be false; `string` is not a subset of `keyof SomeClass`
---@type keyof SomeClass extends string and true or false
local somekey -- is false, should be true here since all keys of this class are strings, but false for classes with any non-string keys