Reducing the control flow nesting depth of

SignatureVerification-verify.sol

function verify(bytes calldata signature, bytes32 hash, address claimedSigner) internal view {
    bytes32 r;
    bytes32 s;
    uint8 v;

    if (claimedSigner.code.length > 0) {
        bytes4 magicValue = IERC1271(claimedSigner).isValidSignature(hash, signature);
        if (magicValue != IERC1271.isValidSignature.selector) revert InvalidContractSignature();
        return;
    }

    if (signature.length == 65) {
        (r, s) = abi.decode(signature, (bytes32, bytes32));
        v = uint8(signature[64]);
    } else if (signature.length == 64) {
        // EIP-2098
        bytes32 vs;
        (r, vs) = abi.decode(signature, (bytes32, bytes32));
        s = vs & UPPER_BIT_MASK;
        v = uint8(uint256(vs >> 255)) + 27;
    } else {
        revert InvalidSignatureLength();
    }
    address signer = ecrecover(hash, v, r, s);
    if (signer == address(0)) revert InvalidSignature();
    if (signer != claimedSigner) revert InvalidSigner();
}