Fix Uptrace filter is not a function error

[ArtyomSavchenko]

[Copilot]

Pull request overview

This PR fixes a runtime error where array methods (like .filter()) were called on non-array values in operator functions. The fix adds defensive validation checks to ensure fields are arrays before performing array operations, and numbers before performing numeric operations.

Key changes:

• Added Array.isArray() checks in $pull and $update operators before calling array methods
• Added numeric type validation in $inc operator to prevent invalid arithmetic operations
• Added comprehensive test coverage for error handling scenarios with invalid input types

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/core/src/operator.ts	Added validation guards with error reporting for $pull, $update, and $inc operators to handle non-array and non-numeric values
packages/core/src/tests/operator.test.ts	Added comprehensive test suite covering edge cases for invalid input types (strings, objects, null, NaN)