Revert Cliff's force-as-enum-hack per his request.

Revert "PUB-880: AIOOBE in Parse"

This reverts commit 372405bb3a03194461d652eb99d73ea86e8b5886.

Revert "Pass forceEnumCol around the cluster"

This reverts commit 8ad2325cafa206f3b05d713e386fdf91a6e48306.

Revert "Remove too-strong assert"

This reverts commit aabbb33953afb8698829b76691e94e67c56e4f60.

Revert "Cmd-line arg to force a col parsed as an enum"

This reverts commit 1929f6693ff50cfd01400042b5251e3ad52d47bd.