explicit setting of a variable does not seem to work with pipe based filters [rt.cpan.org #59208] #174

When the SET directive is used, pipe filtering doesn't seem to be applied 
to the variable.

Example:

  [% foo_uri = "foo bar" | uri %]
  I am encoded '[% foo_uri %]'

  [% SET foo_uri = "foo bar" | uri %]
  I am not encoded '[% foo_uri %]'