Bump zope-interface from 5.0.2 to 5.1.0

[dependabot-preview]

Bumps zope-interface from 5.0.2 to 5.1.0.

Changelog

Sourced from zope-interface's changelog.

5.1.0 (2020-04-08)

• Make @implementer(*iface) and classImplements(cls, *iface) ignore redundant interfaces. If the class already implements an interface through inheritance, it is no longer redeclared specifically for cls. This solves many instances of inconsistent resolution orders, while still allowing the interface to be declared for readability and maintenance purposes. See issue 199.

• Remove all bare except: statements. Previously, when accessing special attributes such as __provides__, __providedBy__, __class__ and __conform__, this package wrapped such access in a bare except: statement, meaning that many errors could pass silently; typically this would result in a fallback path being taken and sometimes (like with providedBy()) the result would be non-sensical. This is especially true when those attributes are implemented with descriptors. Now, only AttributeError is caught. This makes errors more obvious.

  Obviously, this means that some exceptions will be propagated differently than before. In particular, RuntimeError raised by Acquisition in the case of circular containment will now be propagated. Previously, when adapting such a broken object, a TypeError would be the common result, but now it will be a more informative RuntimeError.

  In addition, ZODB errors like POSKeyError could now be propagated where previously they would ignored by this package.

  See issue 200.

• Require that the second argument (bases) to InterfaceClass is a tuple. This only matters when directly using InterfaceClass to create new interfaces dynamically. Previously, an individual interface was allowed, but did not work correctly. Now it is consistent with type and requires a tuple.

• Let interfaces define custom __adapt__ methods. This implements the other side of the 246 adaptation protocol: objects being adapted could already implement __conform__ if they know about the interface, and now interfaces can implement __adapt__ if they know about particular objects. There is no performance penalty for interfaces that do not supply custom __adapt__ methods.

  This includes the ability to add new methods, or override existing interface methods using the new @interfacemethod decorator.

  See issue 3.

• Make the internal singleton object returned by APIs like implementedBy and directlyProvidedBy for objects that implement or provide no interfaces more immutable. Previously an internal cache could be mutated. See issue 204.

Commits

• d28ef60 Preparing release 5.1.0
• 76203eb Merge pull request #203 from zopefoundation/issue199
• bf4f437 Merge pull request #205 from zopefoundation/issue204
• b7a7ad3 Merge pull request #206 from zopefoundation/issue3_minor_cleanup
• bcfa537 Minor cleanup of #202.
• c500360 The ImmutableDeclaration also has immutable _v_attrs.
• 97c0fbc Fix implementerOnly when duplicating something inherited from the parent.
• 4cb3e63 Special case the base Interface in @implementer/classImplements to skip the r...
• 46781f8 Make @implementer and classImplements not re-declare redundant interfaces.
• a404e5f Merge pull request #202 from zopefoundation/issue3
• Additional commits viewable in compare view

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