diff --git a/pkg/eval/builtin_fn_container.go b/pkg/eval/builtin_fn_container.go
index c826ca0b..1a19bf1b 100644
--- a/pkg/eval/builtin_fn_container.go
+++ b/pkg/eval/builtin_fn_container.go
@@ -219,7 +219,7 @@ func rangeFn(fm *Frame, opts rangeOpts, args ...vals.Num) error {
 				What: "step", Valid: "positive", Actual: vals.ToString(step)}
 		}
 	}
-	nums := vals.UnifyNums(rawNums, vals.FixInt)
+	nums := vals.UnifyNums(rawNums, vals.Int)
 
 	out := fm.OutputChan()
 	switch nums := nums.(type) {
diff --git a/pkg/eval/builtin_fn_num_test.go b/pkg/eval/builtin_fn_num_test.go
index 5caa4f78..ea2af9de 100644
--- a/pkg/eval/builtin_fn_num_test.go
+++ b/pkg/eval/builtin_fn_num_test.go
@@ -14,7 +14,7 @@ import (
 
 const (
 	zeros = "0000000000000000000"
-	// Values that exceed the range of int64, used for testing BigInt.
+	// Values that exceed the range of int64, used for testing bigint.
 	z   = "1" + zeros + "0"
 	z1  = "1" + zeros + "1" // z+1
 	z2  = "1" + zeros + "2" // z+2
@@ -43,92 +43,92 @@ func TestFloat64(t *testing.T) {
 
 func TestNumCmp(t *testing.T) {
 	Test(t,
-		// FixInt
+		// int
 		That("< 1 2 3").Puts(true),
 		That("< 1 3 2").Puts(false),
-		// BigInt
+		// bigint
 		That("< "+args(z1, z2, z3)).Puts(true),
 		That("< "+args(z1, z3, z2)).Puts(false),
-		// BigInt and FixInt
+		// bigint and int
 		That("< "+args("1", z1)).Puts(true),
-		// BigRat
+		// bigrat
 		That("< 1/4 1/3 1/2").Puts(true),
 		That("< 1/4 1/2 1/3").Puts(false),
-		// BigRat, BigInt and FixInt
+		// bigrat, bigint and int
 		That("< "+args("1/2", "1", z1)).Puts(true),
 		That("< "+args("1/2", z1, "1")).Puts(false),
-		// Float
+		// float64
 		That("< 1.0 2.0 3.0").Puts(true),
 		That("< 1.0 3.0 2.0").Puts(false),
-		// Float, BigRat and FixInt
+		// float64, bigrat and int
 		That("< 1.0 3/2 2").Puts(true),
 		That("< 1.0 2 3/2").Puts(false),
 
 		// Mixing of types not tested for commands below; they share the same
 		// code path as <.
 
-		// FixInt
+		// int
 		That("<= 1 1 2").Puts(true),
 		That("<= 1 2 1").Puts(false),
-		// BigInt
+		// bigint
 		That("<= "+args(z1, z1, z2)).Puts(true),
 		That("<= "+args(z1, z2, z1)).Puts(false),
-		// BigRat
+		// bigrat
 		That("<= 1/3 1/3 1/2").Puts(true),
 		That("<= 1/3 1/2 1/1").Puts(true),
-		// Float
+		// float64
 		That("<= 1.0 1.0 2.0").Puts(true),
 		That("<= 1.0 2.0 1.0").Puts(false),
 
-		// FixInt
+		// int
 		That("== 1 1 1").Puts(true),
 		That("== 1 2 1").Puts(false),
-		// BigInt
+		// bigint
 		That("== "+args(z1, z1, z1)).Puts(true),
 		That("== "+args(z1, z2, z1)).Puts(false),
-		// BigRat
+		// bigrat
 		That("== 1/2 1/2 1/2").Puts(true),
 		That("== 1/2 1/3 1/2").Puts(false),
-		// Float
+		// float64
 		That("== 1.0 1.0 1.0").Puts(true),
 		That("== 1.0 2.0 1.0").Puts(false),
 
-		// FixInt
+		// int
 		That("!= 1 2 1").Puts(true),
 		That("!= 1 1 2").Puts(false),
-		// BigInt
+		// bigint
 		That("!= "+args(z1, z2, z1)).Puts(true),
 		That("!= "+args(z1, z1, z2)).Puts(false),
-		// BigRat
+		// bigrat
 		That("!= 1/2 1/3 1/2").Puts(true),
 		That("!= 1/2 1/2 1/3").Puts(false),
-		// Float
+		// float64
 		That("!= 1.0 2.0 1.0").Puts(true),
 		That("!= 1.0 1.0 2.0").Puts(false),
 
-		// FixInt
+		// int
 		That("> 3 2 1").Puts(true),
 		That("> 3 1 2").Puts(false),
-		// BigInt
+		// bigint
 		That("> "+args(z3, z2, z1)).Puts(true),
 		That("> "+args(z3, z1, z2)).Puts(false),
-		// BigRat
+		// bigrat
 		That("> 1/2 1/3 1/4").Puts(true),
 		That("> 1/2 1/4 1/3").Puts(false),
-		// Float
+		// float64
 		That("> 3.0 2.0 1.0").Puts(true),
 		That("> 3.0 1.0 2.0").Puts(false),
 
-		// FixInt
+		// int
 		That(">= 3 3 2").Puts(true),
 		That(">= 3 2 3").Puts(false),
-		// BigInt
+		// bigint
 		That(">= "+args(z3, z3, z2)).Puts(true),
 		That(">= "+args(z3, z2, z3)).Puts(false),
-		// BigRat
+		// bigrat
 		That(">= 1/2 1/2 1/3").Puts(true),
 		That(">= 1/2 1/3 1/2").Puts(false),
-		// Float
+		// float64
 		That(">= 3.0 3.0 2.0").Puts(true),
 		That(">= 3.0 2.0 3.0").Puts(false),
 	)
@@ -138,19 +138,19 @@ func TestArithmeticCommands(t *testing.T) {
 	Test(t,
 		// No argument
 		That("+").Puts(0),
-		// FixInt
+		// int
 		That("+ 233100 233").Puts(233333),
-		// BigInt
+		// bigint
 		That("+ "+args(z, z1)).Puts(bigInt(zz1)),
-		// BigInt and FixInt
+		// bigint and int
 		That("+ 1 2 "+z).Puts(bigInt(z3)),
-		// BigRat
+		// bigrat
 		That("+ 1/2 1/3 1/4").Puts(big.NewRat(13, 12)),
-		// BigRat, BigInt and FixInt
+		// bigrat, bigint and int
 		That("+ 1/2 1/2 1 "+z).Puts(bigInt(z2)),
-		// Float
+		// float64
 		That("+ 0.5 0.25 1.0").Puts(1.75),
-		// Float and other types
+		// float64 and other types
 		That("+ 0.5 1/4 1").Puts(1.75),
 
 		// Mixing of types not tested for commands below; they share the same
@@ -161,20 +161,20 @@ func TestArithmeticCommands(t *testing.T) {
 		That("- "+z).Puts(bigInt("-"+z)),
 		That("- 1/2").Puts(big.NewRat(-1, 2)),
 		That("- 1.0").Puts(-1.0),
-		// FixInt
+		// int
 		That("- 20 10 2").Puts(8),
-		// BigInt
+		// bigint
 		That("- "+args(zz3, z1)).Puts(bigInt(z2)),
-		// Float
+		// float64
 		That("- 2.0 1.0 0.5").Puts(0.5),
 
 		// No argument
 		That("*").Puts(1),
-		// FixInt
+		// int
 		That("* 2 7 4").Puts(56),
-		// BigInt
+		// bigint
 		That("* 2 "+z1).Puts(bigInt(zz2)),
-		// Float
+		// float64
 		That("* 2.0 0.5 1.75").Puts(1.75),
 		// 0 * non-infinity
 		That("* 0 1/2 1.0").Puts(0),
@@ -185,14 +185,14 @@ func TestArithmeticCommands(t *testing.T) {
 		That("/ 2").Puts(big.NewRat(1, 2)),
 		That("/ "+z).Puts(bigRat("1/"+z)),
 		That("/ 2.0").Puts(0.5),
-		// FixInt
+		// int
 		That("/ 233333 353").Puts(661),
 		That("/ 3 4 2").Puts(big.NewRat(3, 8)),
-		// BigInt
+		// bigint
 		That("/ "+args(zz, z)).Puts(2),
 		That("/ "+args(zz, "2")).Puts(bigInt(z)),
 		That("/ "+args(z1, z)).Puts(bigRat(z1+"/"+z)),
-		// Float
+		// float64
 		That("/ 1.0 2.0 4.0").Puts(0.125),
 		// 0 / non-zero
 		That("/ 0 1/2 0.1").Puts(0),
diff --git a/pkg/eval/vals/conversion.go b/pkg/eval/vals/conversion.go
index 83160614..6fb7595c 100644
--- a/pkg/eval/vals/conversion.go
+++ b/pkg/eval/vals/conversion.go
@@ -108,13 +108,13 @@ func ScanToGo(src interface{}, ptr interface{}) error {
 func FromGo(a interface{}) interface{} {
 	switch a := a.(type) {
 	case *big.Int:
-		if i, ok := getFixInt(a); ok {
+		if i, ok := getInt(a); ok {
 			return i
 		}
 		return a
 	case *big.Rat:
 		if a.IsInt() {
-			if i, ok := getFixInt(a.Num()); ok {
+			if i, ok := getInt(a.Num()); ok {
 				return i
 			}
 			return a.Num()
diff --git a/pkg/eval/vals/num.go b/pkg/eval/vals/num.go
index 3085fcef..52f46a23 100644
--- a/pkg/eval/vals/num.go
+++ b/pkg/eval/vals/num.go
@@ -43,7 +43,7 @@ type NumType uint8
 // Possible values for NumType, sorted in the order of implicit conversion
 // (lower types can be implicitly converted to higher types).
 const (
-	FixInt NumType = iota
+	Int NumType = iota
 	BigInt
 	BigRat
 	Float64
@@ -59,7 +59,7 @@ func UnifyNums(nums []Num, typ NumType) NumSlice {
 		}
 	}
 	switch typ {
-	case FixInt:
+	case Int:
 		unified := make([]int, len(nums))
 		for i, num := range nums {
 			unified[i] = num.(int)
@@ -126,7 +126,7 @@ func UnifyNums(nums []Num, typ NumType) NumSlice {
 func getNumType(n Num) NumType {
 	switch n.(type) {
 	case int:
-		return FixInt
+		return Int
 	case *big.Int:
 		return BigInt
 	case *big.Rat:
@@ -141,7 +141,7 @@ func getNumType(n Num) NumType {
 // NormalizeBigInt converts a big.Int to an int if it is within the range of
 // int. Otherwise it returns n as is.
 func NormalizeBigInt(z *big.Int) Num {
-	if i, ok := getFixInt(z); ok {
+	if i, ok := getInt(z); ok {
 		return i
 	}
 	return z
@@ -152,7 +152,7 @@ func NormalizeBigInt(z *big.Int) Num {
 func NormalizeBigRat(z *big.Rat) Num {
 	if z.IsInt() {
 		n := z.Num()
-		if i, ok := getFixInt(n); ok {
+		if i, ok := getInt(n); ok {
 			return i
 		}
 		return n
@@ -160,7 +160,7 @@ func NormalizeBigRat(z *big.Rat) Num {
 	return z
 }
 
-func getFixInt(z *big.Int) (int, bool) {
+func getInt(z *big.Int) (int, bool) {
 	// TODO: Use a more efficient implementation by examining z.Bits
 	if z.IsInt64() {
 		i64 := z.Int64()
diff --git a/pkg/eval/vals/num_test.go b/pkg/eval/vals/num_test.go
index fc171a78..0470b846 100644
--- a/pkg/eval/vals/num_test.go
+++ b/pkg/eval/vals/num_test.go
@@ -43,27 +43,27 @@ func TestParseNum(t *testing.T) {
 
 func TestUnifyNums(t *testing.T) {
 	Test(t, Fn("UnifyNums", UnifyNums), Table{
-		Args([]Num{1, 2, 3, 4}, FixInt).
+		Args([]Num{1, 2, 3, 4}, Int).
 			Rets([]int{1, 2, 3, 4}),
 
-		Args([]Num{1, 2, 3, bigInt(z)}, FixInt).
+		Args([]Num{1, 2, 3, bigInt(z)}, Int).
 			Rets([]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3), bigInt(z)}),
 
-		Args([]Num{1, 2, 3, big.NewRat(1, 2)}, FixInt).
+		Args([]Num{1, 2, 3, big.NewRat(1, 2)}, Int).
 			Rets([]*big.Rat{
 				big.NewRat(1, 1), big.NewRat(2, 1),
 				big.NewRat(3, 1), big.NewRat(1, 2)}),
-		Args([]Num{1, 2, bigInt(z), big.NewRat(1, 2)}, FixInt).
+		Args([]Num{1, 2, bigInt(z), big.NewRat(1, 2)}, Int).
 			Rets([]*big.Rat{
 				big.NewRat(1, 1), big.NewRat(2, 1), bigRat(z), big.NewRat(1, 2)}),
 
-		Args([]Num{1, 2, 3, 4.0}, FixInt).
+		Args([]Num{1, 2, 3, 4.0}, Int).
 			Rets([]float64{1, 2, 3, 4}),
-		Args([]Num{1, 2, big.NewRat(1, 2), 4.0}, FixInt).
+		Args([]Num{1, 2, big.NewRat(1, 2), 4.0}, Int).
 			Rets([]float64{1, 2, 0.5, 4}),
-		Args([]Num{1, 2, big.NewInt(3), 4.0}, FixInt).
+		Args([]Num{1, 2, big.NewInt(3), 4.0}, Int).
 			Rets([]float64{1, 2, 3, 4}),
-		Args([]Num{1, 2, bigInt(z), 4.0}, FixInt).
+		Args([]Num{1, 2, bigInt(z), 4.0}, Int).
 			Rets([]float64{1, 2, math.Inf(1), 4}),
 
 		Args([]Num{1, 2, 3, 4}, BigInt).