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get_one accepts arbitrary keywords

Table.get_one accepts arbitrary keywords and doesn't raise an error.

Install fails without psycopg2 (sqlite is available)

It looks like this is due to these lines in pg.py:

from psycopg2.extensions import cursor                                                                                                             
mogrify = cursor.mogrify

It doesn't look like mogrify is used anywhere.

Here's the error:

$ pip install --user dictorm
Collecting dictorm
  Downloading dictorm-3.7.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "/data/data/com.termux/files/tmp/pip-build-0txo2_cf/dictorm/dictorm/dictorm.py", line 10, in <module>
        from dictorm.pg import Select, Insert, Update, Delete, And
      File "/data/data/com.termux/files/tmp/pip-build-0txo2_cf/dictorm/dictorm/pg.py", line 8, in <module>
        from psycopg2.extensions import cursor
    ModuleNotFoundError: No module named 'psycopg2'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/data/data/com.termux/files/tmp/pip-build-0txo2_cf/dictorm/dictorm/__init__.py", line 2, in <module>
        from dictorm.dictorm import * # pragma: no cover
      File "/data/data/com.termux/files/tmp/pip-build-0txo2_cf/dictorm/dictorm/dictorm.py", line 16, in <module>
        from .pg import Select, Insert, Update, Delete, And
      File "/data/data/com.termux/files/tmp/pip-build-0txo2_cf/dictorm/dictorm/pg.py", line 8, in <module>
        from psycopg2.extensions import cursor
    ModuleNotFoundError: No module named 'psycopg2'

Generated Columns are updated

DictORM attempts to update a generated column.

CREATE TABLE foo (
   id SERIAL PRIMARY KEY,
   text_row TEXT,
   id_times_2 INT GENERATED AS (id * 2) STORED
);

>>> Foo = db['foo']
>>> row = Foo().flush()
>>> row['text_row'] = 'foobar'
>>> row.flush()
psycopg2.errors.SyntaxError: column "id_times_2" can only be updated to DEFAULT
DETAIL:  Column "id_times_2" is a generated column.