fix: compare values instead of pointers

[github-actions[bot]]

Benchmark for 5c96c1b

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| Test | Base | PR | % | |------|--------------|------------------|---| | DepthMap::from_parent | **41.2±0.46µs** | 41.9±0.36µs | **+1.70%** | | fix_complex_query | **11.1±0.13ms** | 11.2±0.09ms | **+0.90%** | | parse_complex_query | **2.8±0.04µs** | 2.9±0.03µs | **+3.57%** | | parse_expression_recursion | **5.0±0.23µs** | 5.1±0.05µs | **+2.00%** | | parse_simple_query | **806.3±13.05ns** | 841.1±19.55ns | **+4.32%** |