1. again, the "constraints" collection wasnt really designed to be
mutable, as other initialization steps are performed when you first
specify ForeignKeyConstraint (or ForeignKey) to Table.   if you really
need to use a builder pattern here, make your own collection of columns
and constraints, build that up, then define a function that creates a
Table from that collection once its finished.

2. no support for "CASCADE" in the "DROP" statement right now.  someone
fill me in, is "DROP CASCADE" part of the sql standard ?


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