A bug has been fixed that basically broke the use of setIs() to define
explicit inheritance with coerce= and replace= methods.
For inherited methods to work in this case, the argument(s) need to be
coerced by as() to the defined class in the signature. This was not
being done, meaning that any method that relied on the slots or other
details would fail if the two classes had different representation.
This has been fixed. Doing so required adding an option in setGeneric()
to not use such inheritance. Functions such as initialize() rely on the
object they get really being the original argument, which is the case
with simple inheritance but not always with coerce=. The argument
simpleInheritanceOnly= to setGeneric() adds this option.
Would owners of packages that use this form of setIs() please try out
the fixed code, revision 46546. (That no one has reported this bug
suggests that the feature isn't used much.)
For details on the issue, see ?setIs and the simpleInheritanceOnly=
argument in ?setGeneric.
John
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