Distinguish Inputs, Assignments and Constraints #182
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This splits up the existing package `table` into two packages, `trace` and `schema`. The goal here is just to reduce the amount of stuff in the `schema` package and to provide a clear separation of concerns.
This puts through an extensive refactoring of a `Schema`. Specifically, a schema is made up of three components: _input columns_, _assignments_ and _constraints_. To facilitate this, an `iterator` framework has been developed to simplify the grouping of things together.
DavePearce
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This refactors the notion of a
Schemato specifically split components into: input columns, assignments and constraints. In addition, there are also property assertions (but these remain largely unused at this stage).