Impacted versions:10

Steps to reproduce:
Following the code in https://www.odoo.com/documentation/10.0/api_integration.html both in a fresh install and against 'https://demo.odoo.com/start' trows a type error

Current behavior:
Now I get an error when executing:

```
ids = models.execute_kw(db, uid, password,  'res.partner', 'search',
    [[['is_company', '=', True], ['customer', '=', True]]],
    {'limit': 1})
[record] = models.execute_kw(db, uid, password,
    'res.partner', 'read', [ids])
# count the number of fields fetched by default
len(record)
```

In particular it seems to be a type error (cannot marshal class odoo.tools.float_utils.float_precision)

Expected behavior:
I would expect it to behave as in the documentation

openerp/fields.py
return "%s.%s" % (self.model_name, self.name)
    def __repr__(self):
        return "%s.%s" % (self.model_name, self.name)
    
    #
    
    #
    def setup_base(self, model, name):
        """ Base setup: things that do not depend on other models/fields. """
        if self._setup_done and not self.related:
            
            self._setup_done = 'base'
        else:
            
            self._setup_attrs(model, name)
            if not self.related:
                self._setup_regular_base(model)
            self._setup_done = 'base'
    #
    
    #
    def _can_setup_from(self, field):
        """ Return whether ``self`` can retrieve parameters from ``field``. """
        return isinstance(field, type(self))
    def _setup_attrs(self, model, name):