Preserve YAML string types and explicit numeric evidence

report_value.go

@@ -33,7 +33,8 @@ func normalizeReport(value any) (any, error) {
 
 // DecodeYAMLReport decodes one YAML document from safe inspection output into
 // JSON-compatible values. Unsupported YAML meanings return an error; the result
-// is not a lossless representation of the input document.
+// is not a lossless representation of the input document. Scalar types follow
+// the resolved YAML tags; numeric-looking strings remain strings.
 func DecodeYAMLReport(reader io.Reader) (any, error) {
 	decoder := yaml.NewDecoder(reader)
 	var doc yaml.Node
@@ -104,18 +105,6 @@ func yamlReportValue(node *yaml.Node, visiting map[*yaml.Node]bool) (any, error)
 	case yaml.ScalarNode:
 		switch node.ShortTag() {
 		case "!!str":
-			// The YAML resolver falls back to a string when a numeric scalar is
-			// outside its machine-number range. Preserve explicit and quoted
-			// strings, but do not silently turn a plain numeric scalar into text.
-			if node.Style == 0 {
-				plain := strings.ReplaceAll(node.Value, "_", "")
-				if yamlInteger.MatchString(plain) {
-					return yamlReportNumber(node.Value, "!!int")
-				}
-				if yamlNumericPlain.MatchString(plain) {
-					return yamlReportNumber(node.Value, "!!float")
-				}
-			}
 			return node.Value, nil
 		case "!!null":
 			return nil, nil
@@ -188,7 +177,14 @@ func reportYAMLNode(value any) (*yaml.Node, error) {
 		if strings.ContainsAny(string(v), ".eE") {
 			tag = "!!float"
 		}
-		return &yaml.Node{Kind: yaml.ScalarNode, Tag: tag, Value: string(v)}, nil
+		node := &yaml.Node{Kind: yaml.ScalarNode, Tag: tag, Value: string(v)}
+		// The YAML emitter can omit numeric tags even when its resolver would
+		// classify an overflowing token as a string. Retain the numeric evidence
+		// explicitly; ParseFloat selects only the style, never the stored value.
+		if _, err := strconv.ParseFloat(string(v), 64); err != nil {
+			node.Style = yaml.TaggedStyle
+		}
+		return node, nil
 	case []any:
 		node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
 		for _, item := range v {