`mysql.dml.Insert.values` shadows the generative function `sql.expression.Insert.values`

When using the ON DUPLICATE KEY UPDATE support for MySQL, the .values() generative function is not available, contrary to the claims made by the documentation.

Traceback (most recent call last):
  File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "kronos/__main__.py", line 97, in <module>
    cli()
  File "/home/ashu/Documents/kronos/venv/lib/python3.5/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/ashu/Documents/kronos/venv/lib/python3.5/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "kronos/__main__.py", line 31, in invoke
    return super(CLI, self).invoke(ctx)
  File "/home/ashu/Documents/kronos/venv/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/ashu/Documents/kronos/venv/lib/python3.5/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/ashu/Documents/kronos/venv/lib/python3.5/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/ashu/Documents/kronos/scripts/gilmore_from_scratch.py", line 46, in gilmore_from_scratch
    stmt = insert(GilmoreItem.__table__).values(**to_insert)
TypeError: 'ImmutableColumnCollection' object is not callable

It appears to be shadowed by the .values property intended to support the VALUES(...) construct. Perhaps the column collection could be named values_ instead?

The workaround is to specify values with the insert constructor:

stmt = insert(GilmoreItem.__table__, values=to_insert)

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