fixme:         "decoding cbor data tagged with 1 produces time.Time instead of RFC3339 timestamp string",
				assertOnError: assertNilError,
			},
		})

		group(t, "unsigned bignum", []test{
			{
				name:  "rejected",
				in:    hex("c249010000000000000000"), // 2(18446744073709551616)
				fixme: "decoding cbor data tagged with 2 produces big.Int instead of rejecting",

	crypto/internal/edwards25519,
	crypto/md5,
	crypto/rc4,
	crypto/sha1,
	crypto/sha256,
	crypto/sha512,
	golang.org/x/crypto/sha3
	< CRYPTO;

	CGO, fmt, net !< CRYPTO;

	# CRYPTO-MATH is core bignum-based crypto - no cgo, net; fmt now ok.
	CRYPTO, FMT, math/big
	< crypto/internal/boring/bbig
	< crypto/rand
	< crypto/internal/mlkem768
	< crypto/ed25519
	< encoding/asn1
	< golang.org/x/crypto/cryptobyte/asn1

      if (normalizedBits + productBits >= Long.SIZE) {
        bignums.add(BigInteger.valueOf(product));
        product = 1;
        productBits = 0;
      }
      product *= normalizedNum;
      productBits = LongMath.log2(product, FLOOR) + 1;
    }
    // Check for leftovers.
    if (product > 1) {
      bignums.add(BigInteger.valueOf(product));
    }

      if (normalizedBits + productBits >= Long.SIZE) {
        bignums.add(BigInteger.valueOf(product));
        product = 1;
        productBits = 0;
      }
      product *= normalizedNum;
      productBits = LongMath.log2(product, FLOOR) + 1;
    }
    // Check for leftovers.
    if (product > 1) {
      bignums.add(BigInteger.valueOf(product));
    }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }

	SYS_FCHFLAGS                 = 35  // { int fchflags(int fd, u_long flags); }
	SYS_SYNC                     = 36  // { int sync(void); }
	SYS_KILL                     = 37  // { int kill(int pid, int signum); }
	SYS_GETPPID                  = 39  // { pid_t getppid(void); }
	SYS_DUP                      = 41  // { int dup(u_int fd); }
	SYS_PIPE                     = 42  // { int pipe(void); }

func intFromArg(a []any, argNum int) (num int, isInt bool, newArgNum int) {
	newArgNum = argNum
	if argNum < len(a) {
		num, isInt = a[argNum].(int) // Almost always OK.
		if !isInt {
			// Work harder.
			switch v := reflect.ValueOf(a[argNum]); v.Kind() {
			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
				n := v.Int()

	argNum := state.argNums[formatArg]
	if argNum <= 0 {
		// Shouldn't happen, so catch it with prejudice.
		panic("negative arg num")
	}
	if argNum < len(call.Args)-1 {
		return true // Always OK.
	}
	if call.Ellipsis.IsValid() {
		return false // We just can't tell; there could be many more arguments.
	}
	if argNum < len(call.Args) {
		return true
	}

	SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }