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## Summary
Add type narrowing for `type(x) is C` conditions (and `else` clauses of
`type(x) is not C` conditionals):
```py
if type(x) is A:
reveal_type(x) # revealed: A
else:
reveal_type(x) # revealed: A | B
```
closes: #14431, part of: #13694
## Test Plan
New Markdown-based tests.
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