Update for new semantics of exclusiveMin/Max

Author: mdboom

source/reference/numeric.rst

@@ -152,24 +152,22 @@ Ranges of numbers are specified using a combination of the
 ``minimum`` and ``maximum`` keywords (or ``exclusiveMinimum`` and
 ``exclusiveMaximum`` for expressing exclusive range).
 
-- ``minimum`` specifies an inclusive lower limit for a numeric instance,
-  i.e., :math:`x \ge\mathrm{min}`.
-  
-- ``exclusiveMinimum`` specifies an exclusive lower limit for a numeric instance,
-  i.e., :math:`x > \mathrm{min}`.  
-
-- ``maximum`` specifies an inclusive upper limit for a numeric instance,
-  i.e., :math:`x \le\mathrm{max}`.
-  
-- ``exclusiveMaximum`` specifies an exclusive upper limit for a numeric 
-  instance.  , i.e., :math:`x < \mathrm{max}`.
+If *x* is the value being validated, the following must hold true:
+
+  - *x* ≥ ``minimum``
+  - *x* > ``exclusiveMinimum``
+  - *x* ≤ ``maximum``
+  - *x* < ``exclusiveMaximum``
+
+While you can specify both of ``minimum`` and ``exclusiveMinimum`` or both of
+``maximum`` and ``exclusiveMinimum``, it doesn't really make sense to do so.
 
 .. schema_example::
 
     {
       "type": "number",
       "minimum": 0,
-      "maximum": 100
+      "exclusiveMaximum": 100
     }
     --X
     // Less than ``minimum``:
@@ -182,21 +180,41 @@ Ranges of numbers are specified using a combination of the
     --
     99
     --X
-    // ``maximum`` is inclusive, so 100 is valid:
-    100
-    --X
-    // Greater than ``maximum``:
-    101
-
-.. schema_example::
-    {
-      "type": "number",
-      "minimum": 0,
-      "exclusiveMaximum": 100
-    }
-    --X
     // ``exclusiveMaximum`` is exclusive, so 100 is not valid:
     100
     --X
     // Greater than ``maximum``:
     101
+
+.. language_specific::
+
+    --Draft 4
+    In JSON Schema Draft 4, ``exclusiveMinimum`` and ``exclusiveMaximum`` work differently.  There they are boolean values, that indicate whether ``minimum`` and ``maximum`` are exclusive of the value.  For example:
+
+    - if ``exclusiveMinimum`` is ``false``, *x* ≥ ``minimum``.
+    - if ``exclusiveMinimum`` is ``true``, *x* > ``minimum``.
+
+    .. schema_example:: 4
+
+        {
+          "type": "number",
+          "minimum": 0,
+          "maximum": 100,
+          "exclusiveMaximum": true
+        }
+        --X
+        // Less than ``minimum``:
+        -1
+        --
+        // ``exclusiveMinimum`` was not specified, so 0 is included:
+        0
+        --
+        10
+        --
+        99
+        --X
+        // ``exclusiveMaximum`` is ``true``, so 100 is not included:
+        100
+        --X
+        // Greater than ``maximum``:
+        101