refactor: WF.Eqns: rewrite fix without duplicating F #6859
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This PR changes how WF.Eqns unfolds the fixpoint. Instead of delta'ing until we have `fix`, and then blindly applying `fix_eq`, we delta one step less and preserve the function on the right hand side. This leads to smaller terms in the next step, so easier to debug, possibly faster, possibly more robust.
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This PR changes how WF.Eqns unfolds the fixpoint. Instead of delta'ing
until we have
fix, and then blindly applyingfix_eq, we delta onestep less and preserve the function on the right hand side. This leads
to smaller terms in the next step, so easier to debug, possibly faster,
possibly more robust.