async fn user_metadata_operation(
source: &CommandSource,
targets: GameProfileArgument,
expression: PermissionMetadataExpression,
value: Option<PermissionMetadataValue>,
) -> Result<OperationResult, CommandSyntaxError>async fn user_metadata_operation(
source: &CommandSource,
targets: GameProfileArgument,
expression: PermissionMetadataExpression,
value: Option<PermissionMetadataValue>,
) -> Result<OperationResult, CommandSyntaxError>