[Altair] Add regression test for parsing non-Altair StandardConfig

[paulhauner]

Issue Addressed

NA

Proposed Changes

I was wondering why StandardConfig was wrapped in a SuperStruct, so I figured I'd let the compiler tell me. I'll let this run against CI to see if there's anything I've missed.

Adds a regression test to ensure we can parse a StandardConfig without Altair params.

Additional Info

NA

[michaelsproul]

This is for backwards compatibility, and I added it relatively recently. I wanted to be able to parse a "base-only" config from JSON, as this was required to work with the Pyrmont Teku nodes hosted by Infura.

With Proto's config overhaul we'll need to restructure again, so I'm against changing this for now

[michaelsproul]

Proto's PR: ethereum/consensus-specs#2390

[paulhauner]

This is for backwards compatibility, and I added it relatively recently. I wanted to be able to parse a "base-only" config from JSON, as this was required to work with the Pyrmont Teku nodes hosted by Infura.

Ooh right, I didn't pick up that the serde(untagged) was achieving this, given the SuperStruct stuff in macro-land.

I've reverted my previous commit and added a regression test to prevent this happening again.

[paulhauner]

Oh, this test already exists as decode_no_altair, my bad. I'll close this.

[michaelsproul]

No worries, I appreciate the attention to detail