Comment by piskov

The pattern matching and absence or real thinking is still strong.

Tried to move some excel generation logic from epplus to closedxml library.

ClosedXml has basically the same API so the conversion was successful. Not a one-shot but relatively easy with a few manual edits.

But closedxml has no batch operations (like apply style to the entire column): the api is there but internal implementation is on cell after cell basis. So if you have 10k rows and 50 columns every style update is a slow operation.

Naturally, told all about this to codex 5.3 max thinking level. The fucker still succumbed to range updates here and there.

Told it explicitly to make a style cache and reuse styles on cells on same y axis.

5-6 attempts — fucker still tried ranges here and there. Because that is what is usually done.

Not here yet. Maybe in a year. Maybe never.