[issue21708] Deprecate nonstandard behavior of a dumbdbm database

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thanks Raymond for your attention.

Readonly warnings are emitted only when dumpdbm database opened in read only mode. They will be turned into exceptions in future (3.6 or 3.7). Annoying warnings on changed in future operations is desirable effect.

If you worry about performance hit of such checks, __setitem__ and __delitem__ are expensive operations doing file I/O.

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<http://bugs.python.org/issue21708>
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