Make sure to treat "nan", "-nan", and "+nan" as identical

go.mod

@@ -3,7 +3,7 @@ module github.com/toml-lang/toml-test
 go 1.18
 
 require (
-	github.com/BurntSushi/toml v1.2.2-0.20230116181612-fcbab7400715
+	github.com/BurntSushi/toml v1.3.3-0.20230930221951-d17285a02783
 	// no_term branch, which doesn't depend on x/term and x/sys
 	zgo.at/zli v0.0.0-20220603144954-fdab8cc4d9d8
 )

go.sum

@@ -1,4 +1,4 @@
-github.com/BurntSushi/toml v1.2.2-0.20230116181612-fcbab7400715 h1:wpQ/gpMTRuiaIOlcOImLxe7XF7FQ/Q5vmrQDEAHpGmI=
-github.com/BurntSushi/toml v1.2.2-0.20230116181612-fcbab7400715/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/BurntSushi/toml v1.3.3-0.20230930221951-d17285a02783 h1:q97mwa1LRDI6nt31wvg+nEVzHdgifAkGzXBIzS2KCEk=
+github.com/BurntSushi/toml v1.3.3-0.20230930221951-d17285a02783/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 zgo.at/zli v0.0.0-20220603144954-fdab8cc4d9d8 h1:Cvmn2mATNsxwIVjKv91UHWdInUqjA/oWMH9kAUuzojQ=
 zgo.at/zli v0.0.0-20220603144954-fdab8cc4d9d8/go.mod h1:HLAc12TjNGT+VRXr76JnsNE3pbooQtwKWhX+RlDjQ2Y=

json.go

@@ -146,6 +146,7 @@ func (r Test) cmpAsStrings(want, have string) Test {
 func (r Test) cmpFloats(want, have string) Test {
 	// Special case for NaN, since NaN != NaN.
 	if strings.HasSuffix(want, "nan") || strings.HasSuffix(have, "nan") {
+		want, have := strings.TrimLeft(want, "-+"), strings.TrimLeft(have, "-+")
 		if want != have {
 			return r.fail("Values for key '%s' don't match:\n"+
 				"  Expected:     %v\n"+

json_test.go

@@ -28,3 +28,40 @@ func TestCompareDatetime(t *testing.T) {
 		})
 	}
 }
+
+func TestCompareNaN(t *testing.T) {
+	a := map[string]any{
+		"nan": map[string]any{
+			"type":  "float",
+			"value": "nan",
+		},
+	}
+	b := map[string]any{
+		"nan": map[string]any{
+			"type":  "float",
+			"value": "+nan",
+		},
+	}
+	c := map[string]any{
+		"nan": map[string]any{
+			"type":  "float",
+			"value": "-nan",
+		},
+	}
+
+	{
+		r := Test{}
+		r = r.CompareJSON(a, b)
+		if r.Failure != "" {
+			t.Fatal(r.Failure)
+		}
+	}
+
+	{
+		r := Test{}
+		r = r.CompareJSON(b, c)
+		if r.Failure != "" {
+			t.Fatal(r.Failure)
+		}
+	}
+}