0.8.3

• New module-level functions: validate() and is_valid().
• DataQuery selections now default to a list type when no outer-container is specified.
• New DataQuery.apply() method for group-wise function application.
• DataSource.fieldnames attribute is now a tuple (was a list).
• The ValidationError repr now prints a trailing comma with the last item (for ease of copy-and-paste work flow).
• Revised sequence validation behavior provides more precise differences.
• New truncation support for ValidationErrors with long lists of differences.
• Excess differences in allowed_specific() definitions no longer trigger test failures.
• New support for user-defined functions to narrow DataSource selections.
• Better traceback hiding for pytest.
• Fix bug in DataQuery.map() method--now converts set types into lists.

0.8.2

• Implement Boolean composition for allowed_specific() context manager.
• Add proper __repr__() support to DataSource and DataQuery.
• Make sure DataQuery fails early if bad "select" syntax is used or if unknown columns are selected.
• Add __copy__() method to DataQuery.
• Change parent class of differences so they no longer inherit from Exception (this confused their intended use).
• Restructure documentation for ease of reference.

0.8.1

• Updated DataQuery select behavior to fail immediately when invalid syntax is used (rather than later when attempting to execute the query).
• Improved error messages to better explain what went wrong.

0.8.0

• Replaces old assertion methods with a single, smarter assertValid() method.
• DataQuery implements query optimization and uses a simpler and more expressive syntax.
• Allowances and errors have been reworked to be more expressive.
• Allowances are now composeable with bit-wise "&" and "|" operators.

0.7.0.dev2

• Removes some of the internal magic and renames data assertions to more
  clearly indicate their intended use.
• Restructures data allowances to provide more consistent
  parameters and more flexible usage.
• Adds new method to assert unique values.
• Adds full **fmtparams support for CSV handling.
• Fixes comparison and allowance behavior for None vs. zero.

0.6.0.dev1

First public release.