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I'd like to set an upper limit on the size of a storage map. Is there a data structure that supports this check within its methods? Or has anyone defined their own wrapper data structure that performs these checks on each insertion?

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If you want a hard limit, then you have to create a wrapper.
The MaxValues on StorageMap and CountedStorageMap are only a soft limit for PoV estimations.

I dont know of any implementations of this. Not sure what you are trying to do either.

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There is a counted storage map: https://github.com/paritytech/substrate/blob/6507a79b2baf7e4cc6f5868aa490dfe275144f9a/frame/support/src/storage/types/counted_map.rs#L38-L50

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  • As discussed in dms, insert and set don't perform any max count check. Not sure what the purpose of MaxValues is.
    – Daniel Savu
    May 17 at 16:52
  • The MaxValues is to calculate an upper limit for the worst-case Proof size estimation.
    – Oliver Tale-Yazdi
    May 18 at 20:06

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