For most use cases, developers probably want to have the int-typed valueChanged
signal, and not the unicode one (which is the default when using
.valueChanged.connect() on a QSpinBox object). I propose to add the following
example to the documentation page of QSpinBox to show how to connect the
valueChanged(int) signal, i.e.:

    spinbox.connect(SIGNAL('valueChanged(int)'), callback_int) 

The documentation page where I think this would fit is the following:

    http://www.pyside.org/docs/pyside/PySide/QtGui/QSpinBox.html

======
from PySide.QtCore import *
from PySide.QtGui import *

import sys

app = QApplication(sys.argv)

def callback_int(value_as_int):
    print 'int value changed:', repr(value_as_int)

def callback_unicode(value_as_unicode):
    print 'unicode value changed:', repr(value_as_unicode)

spinbox = QSpinBox()
spinbox.connect(SIGNAL('valueChanged(int)'), callback_int) 
spinbox.valueChanged.connect(callback_unicode) 
spinbox.show()

sys.exit(app.exec_())
======

The reason for this proposal is because the question came up on IRC and the
answer wasn't obvious at first, because most signal examples only show the
.<signalname>.connect() method without the parameter type signature.