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Don't warn about an unused variable

Adds an object to the module using the given name. Throws if an object with the given name already exists. overwrite should almost always be false:

This can only be used inside a pybind11-bound function, either by `argument_loader` at argument preparation time or by `py::cast()` at execution time.

appends the extents to shape

Constructs an argument with the name of the argument; if null or omitted, this is a positional argument.

Delegating constructor needed when both moving and accessing in the same constructor