fn discover_common_module_api_version(
client_versions: &SupportedModuleApiVersions,
peer_versions: &BTreeMap<PeerId, SupportedModuleApiVersions>,
) -> Option<ApiVersion>
fn discover_common_module_api_version(
client_versions: &SupportedModuleApiVersions,
peer_versions: &BTreeMap<PeerId, SupportedModuleApiVersions>,
) -> Option<ApiVersion>