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 4.81%

⚠️ 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]	27.4 ms	25.9 ms	+5.87%
⚡	Simulation	test_evaluate_page_with_hooks[_complicated_page]	27.6 ms	26.1 ms	+5.72%
⚡	Simulation	test_evaluate_page[_stateful_page]	4.6 ms	4.4 ms	+4.56%
⚡	Simulation	test_evaluate_page_with_hooks[_stateful_page]	4.8 ms	4.6 ms	+4.24%
⚡	Simulation	test_console_log	382.4 µs	368.7 µs	+3.7%

Tip

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

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_{Comparing benedikt-bartscher:use-lazy-loader-branch (25b877d) with main (f7c848f)²}

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. ↩

2. No successful run was found on main (45b8ed5) during the generation of this report, so f7c848f was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[greptile-apps]

Greptile Summary

The PR adds Python 3.15 compatibility and CI coverage while improving repeated lazy-import access and adopting native lazy imports where available.

• Replaces use of the removed private dataclasses missing-type class with a compatibility alias.
• Adds native PEP 810 lazy-import bindings and caches classically resolved lazy attributes.
• Updates TypedDict handling for NoExtraItems.
• Adjusts Python 3.15 dependency resolution and known dill-related test expectations.
• Extends unit and integration CI matrices to Python 3.15.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/utils/lazy_loader.py	Adds native Python 3.15 lazy imports and caches resolved classic lazy attributes; no eligible follow-up defect was established.
packages/reflex-base/src/reflex_base/utils/compat.py	Introduces a version-compatible public alias for the dataclasses missing-value type.
packages/reflex-base/src/reflex_base/utils/types.py	Normalizes PEP 728 NoExtraItems metadata during nested TypedDict validation.
pyproject.toml	Selects pure-Python psycopg on Python 3.15 while retaining the binary extra on earlier versions.
uv.lock	Updates Python-version resolution partitions and psycopg markers for Python 3.15.
.github/workflows/unit_tests.yml	Extends Linux, Windows, and macOS unit-test matrices to Python 3.15.
.github/workflows/integration_app_harness.yml	Extends Redis and memory-backed integration matrices to Python 3.15.

_{Reviews (11): Last reviewed commit: "Merge remote-tracking branch 'upstream/m..." | 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>