stream upToAll leaves stream position in a different place than in Pharo

In Pharo:

    'http://vimeo.com/18375790' readStream upToAll: '.com/'; upToEnd.

results in:

    '18375790'

In Gemstone the same code results in:

    '.com/18375790'

This is caused by the stream position after #upToAll: . In Pharo the following:

    'http://vimeo.com/18375790' readStream upToAll: '.com/'; position

results in:

     17

In Gemstone the same code results in:  12