How to use the @0x/assert.assert.isNumberOrBigNumber function in @0x/assert

async callAsync(
            hash: string,
            v: number | BigNumber,
            r: string,
            s: string,
            callData: Partial = {},
            defaultBlock?: BlockParam,
        ): Promise {
            assert.isString('hash', hash);
            assert.isNumberOrBigNumber('v', v);
            assert.isString('r', r);
            assert.isString('s', s);
            assert.doesConformToSchema('callData', callData, schemas.callDataSchema, [
                schemas.addressSchema,
                schemas.numberSchema,
                schemas.jsNumber,
            ]);
            if (defaultBlock !== undefined) {
                assert.isBlockParam('defaultBlock', defaultBlock);
            }
            const self = (this as any) as AbiGenDummyContract;
            const encodedData = self._strictEncodeArguments('ecrecoverFn(bytes32,uint8,bytes32,bytes32)', [
                hash,
                v,
                r,
                s,

public ecrecoverFn(hash: string, v: number | BigNumber, r: string, s: string): ContractFunctionObj {
        const self = (this as any) as AbiGenDummyContract;
        assert.isString('hash', hash);
        assert.isNumberOrBigNumber('v', v);
        assert.isString('r', r);
        assert.isString('s', s);
        const functionSignature = 'ecrecoverFn(bytes32,uint8,bytes32,bytes32)';

        return {
            async callAsync(callData: Partial = {}, defaultBlock?: BlockParam): Promise {
                BaseContract._assertCallParams(callData, defaultBlock);
                const rawCallResult = await self._evmExecAsync(this.getABIEncodedTransactionData());
                const abiEncoder = self._lookupAbiEncoder(functionSignature);
                return abiEncoder.strictDecodeReturnValue(rawCallResult);
            },
            getABIEncodedTransactionData(): string {
                return self._strictEncodeArguments(functionSignature, [hash, v, r, s]);
            },
        };
    }