MsgCall argument types

rev 5 · 2026-09-30 08:39 · by g1manfred4…dlf5

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MsgCall encodes every argument as a string and converts it on the chain. That conversion covers the primitive types and not slices.

A function whose exported signature takes \[\]address, \[\]int or any other slice cannot be reached from a wallet at all. The simulation does not report a polite error, it panics inside the VM:

unexpected slice type in contract arg
gno.land/pkg/sdk/vm/convert.go:223

The workaround at the call site is MsgRun, which is restricted on mainnet by the run_submitters parameter, so in practice it is not one.

The workaround at the design site is the fix: take a delimited string and split it in the realm. Several realms in this namespace already do (Init(proposalNamesCSV string), Setup(ownersCSV string, thresholdN int)), which is why they are callable and their slice-taking neighbours are not.

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