port lazy_loader perf and native PEP810 + add python3.15 support

[benedikt-bartscher]

scientific-python/lazy-loader#172
scientific-python/lazy-loader#173

[codspeed-hq]

Merging this PR will improve performance by 4.63%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 5 improved benchmarks
✅ 22 untouched benchmarks
⏩ 8 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	test_evaluate_page[_complicated_page]	27.2 ms	25.9 ms	+5.17%
⚡	Simulation	test_evaluate_page_with_hooks[_complicated_page]	27.4 ms	26.1 ms	+5.04%
⚡	Simulation	test_evaluate_page[_stateful_page]	4.5 ms	4.3 ms	+4.83%
⚡	Simulation	test_evaluate_page_with_hooks[_stateful_page]	4.7 ms	4.5 ms	+4.55%
⚡	Simulation	test_console_log	372.5 µs	359.7 µs	+3.58%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing benedikt-bartscher:use-lazy-loader-branch (3f63842) with main (d86f167)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[greptile-apps]

Greptile Summary

The PR adds Python 3.15 CI coverage and compatibility while optimizing lazy imports.

• Uses native PEP 810 lazy imports on Python 3.15 and caches attributes on earlier versions.
• Replaces removed private dataclasses typing references with a compatibility alias.
• Updates TypedDict sentinel handling and Python-version-specific dependency resolution.
• Adjusts tests for known Python 3.15 serialization incompatibilities.

Confidence Score: 5/5

The PR appears safe to merge because no blocking follow-up-eligible failure or outstanding prior finding was established.

No blocking failure remains in the review’s eligible finding set.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/utils/lazy_loader.py	Adds native Python 3.15 lazy-import bindings and caches attributes resolved through the legacy loader; no follow-up-eligible finding was established.
packages/reflex-base/src/reflex_base/utils/compat.py	Introduces a public compatibility alias for the dataclasses missing-value type removed from Python 3.15.
packages/reflex-base/src/reflex_base/utils/types.py	Normalizes PEP 728 NoExtraItems sentinels before validating TypedDict extra values.
pyproject.toml	Selects pure-Python psycopg on Python 3.15 because binary wheels are unavailable.
uv.lock	Re-resolves dependency markers for Python 3.15 and records the version-specific psycopg selections.
tests/units/test_state.py	Marks the dill fallback serialization test as an expected Python 3.15 failure pending upstream compatibility.
tests/integration/test_dynamic_components.py	Skips the Redis dynamic-components scenario affected by the known dill incompatibility on Python 3.15.

_{Reviews (7): Last reviewed commit: "revert" | Re-trigger Greptile}

[cubic-dev-ai]

All reported issues were addressed across 17 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>