bpo-32043: Rephrase -X dev documentation (#4478)
* should not be more verbose if the code is correct * enabled checks can be "expensive"
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@ -411,8 +411,10 @@ Miscellaneous options
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nested imports). Note that its output may be broken in multi-threaded
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application. Typical usage is ``python3 -X importtime -c 'import
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asyncio'``. See also :envvar:`PYTHONPROFILEIMPORTTIME`.
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* ``-X dev`` enables the "developer mode": enable debug checks at runtime.
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Developer mode:
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* ``-X dev``: enable CPython's "developer mode", introducing additional
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runtime checks which are too expensive to be enabled by default. It should
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not be more verbose than the default if the code is correct: new warnings
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are only emitted when an issue is detected. Effect of the developer mode:
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* Warning filters: add a filter to display all warnings (``"default"``
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action), except of :exc:`BytesWarning` which still depends on the
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@ -441,8 +443,7 @@ Miscellaneous options
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The ``-X showalloccount`` option.
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.. versionadded:: 3.7
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The ``-X importtime``, ``-X dev`` and :envvar:`PYTHONPROFILEIMPORTTIME`
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options.
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The ``-X importtime`` and ``-X dev`` options.
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Options you shouldn't use
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