PHPC-1933: Cursor::key() return type is mixed #1259
Merged
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https://jira.mongodb.org/browse/PHPC-1933
Using IS_LONG produces a fatal error in PHP 8.1 if the position is invalid and Cursor::key() returns null.
This wasn't caught in #1245 because we don't have PHP 8.1 in CI yet. I must have missed this failure when testing locally.