Revert "Made us not compute default_filter_val until the eval_impl in filter_term_t."
Revert "Made us not compute default_filter_val until the eval_impl in filter_term_t."

This reverts commit e6a0f3c9bbc9acb56542f190dec28128eba05de9.

It also fixes a really surprising polyglot test failure.  Our code is
completely insane fragile crap.

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