src/jdk/nashorn/internal/objects/NativeJSON.java

*** 160,185 ****
          // If the space parameter is a number, make an indent
          // string containing that many spaces.
  
          String gap;
  
!         if (space instanceof Number || space instanceof NativeNumber) {
!             int indent;
!             if (space instanceof NativeNumber) {
!                 indent = ((NativeNumber)space).intValue();
!             } else {
!                 indent = ((Number)space).intValue();
              }
  
              final StringBuilder sb = new StringBuilder();
!             for (int i = 0; i < Math.min(10, indent); i++) {
                  sb.append(' ');
              }
              gap = sb.toString();
! 
!         } else if (space instanceof String || space instanceof ConsString || space instanceof NativeString) {
!             final String str = (space instanceof String) ? (String)space : space.toString();
              gap = str.substring(0, Math.min(10, str.length()));
          } else {
              gap = "";
          }
  
--- 160,190 ----
          // If the space parameter is a number, make an indent
          // string containing that many spaces.
  
          String gap;
  
!         // modifiable 'space' - parameter is final
!         Object modSpace = space;
!         if (modSpace instanceof NativeNumber) {
!             modSpace = JSType.toNumber(JSType.toPrimitive(modSpace, Number.class));
!         } else if (modSpace instanceof NativeString) {
!             modSpace = JSType.toString(JSType.toPrimitive(modSpace, String.class));
          }
  
+         if (modSpace instanceof Number) {
+             int indent = Math.min(10, JSType.toInteger(modSpace));
+             if (indent < 1) {
+                 gap = "";
+             } else {
                  final StringBuilder sb = new StringBuilder();
!                 for (int i = 0; i < indent; i++) {
                      sb.append(' ');
                  }
                  gap = sb.toString();
!             }
!         } else if (modSpace instanceof String || modSpace instanceof ConsString) {
!             final String str = modSpace.toString();
              gap = str.substring(0, Math.min(10, str.length()));
          } else {
              gap = "";
          }