Fix incorrect "null" default value check in checkDefault #780
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This PR fixes a bug in checkDefault where the code was checking typeof field instead of typeof field.default. Because of that, nullable fields with a default value of "null" were being incorrectly flagged as invalid.
What i was fixed
Updated the condition to correctly check typeof field.default, allowing "null" defaults to pass validation as intended.
Verification
I reproduced the issue using a standalone script (repro_bug_standalone.js):
Before the fix: "null" defaults were incorrectly flagged.
After the fix: The check works as expected.
This brings the behavior of checkDefault back in line with how nullable fields should be handled.
fixes #779