51461f4842
Summary:
Before this patch, an object whose type has read-only attributes cannot
be passed to `stmt.run`/etc., because the libdef does not promise not to
mutate its argument. This patch fixes that oversight.
Test Plan:
Create the following test file, and note that it fails to typecheck
before this change but passes after:
```js
// @flow
import Database from "better-sqlite3";
const db = new Database("/tmp/foo");
const args: {|+id: number|} = {id: 1};
db.prepare("INSERT INTO foo (id) VALUES (?)").run(args);
```
wchargin-branch: flow-better-sqlite3-bound-parameters-covariant
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