Improve typing

[jpcampb2]

This is a long-term issue that will collect issues surrounding the use of types in great expectations.

Opening now to flag the coercion of boolean True/False by column_aggregate_expectations in ways that may be counterintuitive.

In general, we've talked about wanting to handle gracefully all of the following realities, while emphasizing semantic types:

• "semantic" types, such as continuous, categorical, boolean
• "data" types: such as number, string, boolean
• "implementation" types: int64, int32, utf-8, etc

[abegong]

Linking #110

[abegong]

Here's how SQLAlchemy handles typing: http://docs.sqlalchemy.org/en/latest/core/type_basics.html.

Might be a good starting point...

[stale]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[jcampbell]

Improvements to "implementation" types are in place, and other type issues are currently handled by bundling expectations or custom expectations in practice.