dyn/convert: Properly detect zero float64 values (#3371)

https://github.com/databricks/cli/pull/3230/files#r2256951451

Author: denik

libs/dyn/convert/from_typed_test.go

@@ -152,6 +152,30 @@ func TestFromTypedStructZeroFieldsIntoExistingFields(t *testing.T) {
 	}), nv)
 }
 
+func TestFromTypedStructZeroFieldsIntoExistingFieldsFloat64(t *testing.T) {
+	type Tmp struct {
+		Foo             float64  `json:"foo"`
+		Bar             float64  `json:"bar,omitempty"`
+		BazBugz         float64  `json:"baz_bugs,omitempty"`
+		ForceSendFields []string `json:"-"`
+	}
+
+	src := Tmp{ForceSendFields: []string{"BazBugz"}}
+
+	ref := dyn.V(map[string]dyn.Value{
+		"foo":      dyn.V(1.2),
+		"bar":      dyn.V(1.2),
+		"baz_bugs": dyn.V(1.2),
+	})
+
+	nv, err := FromTyped(src, ref)
+	require.NoError(t, err)
+	dynassert.Equal(t, dyn.V(map[string]dyn.Value{
+		"foo":      dyn.V(0.0),
+		"baz_bugs": dyn.V(0.0),
+	}), nv)
+}
+
 func TestFromTypedStructSetFieldsRetainLocation(t *testing.T) {
 	type Tmp struct {
 		Foo string `json:"foo"`

libs/dyn/value.go

@@ -154,7 +154,7 @@ func (v Value) IsZero() bool {
 	case KindInt:
 		return v.v == 0
 	case KindFloat:
-		return v.v == 0
+		return v.v == 0.0
 	case KindTime:
 		t := v.v.(Time)
 		return t.IsZero()