rom-rb / rom / 1799

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Pull #377

travis-ci

Add support for defining schema types for reading data

This extends schema DSL with the ability to define "read" type that will
be used when a relation loads its tuples. By default we set this to a
noop passthrough-proc but if there are any attributes with a special
"read" type then we use relation's `output_schema` which is built
from schema attributes including "read" types.

This is a last-moment addition but it turned out we can't support
various custom DB types without this feature, and it was planned already
for rom 3.1.0 anyway.

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