add numeric strings in box_precomputed-stats mock

Author: etpinard

test/image/mocks/box_precomputed-stats.json

@@ -4,9 +4,9 @@
       "type": "box",
       "name": "[V] just q1/median/q3",
       "offsetgroup": "1",
-      "q1": [ 1, 2, 1 ],
-      "median": [ 2, 3, 2 ],
-      "q3": [ 3, 4, 3 ]
+      "q1": [ 1, "2", 1 ],
+      "median": [ 2, 3, "2" ],
+      "q3": [ "3", 4, 3 ]
     },
     {
       "type": "box",
@@ -15,8 +15,8 @@
       "q1": [ 1, 2, 1 ],
       "median": [ 2, 3, 2 ],
       "q3": [ 3, 4, 3 ],
-      "lowerfence": [ 0, 1, 0 ],
-      "upperfence": [ 4, 5, 4 ]
+      "lowerfence": [ 0, "1", 0 ],
+      "upperfence": [ 4, 5, "4" ]
     },
     {
       "type": "box",
@@ -27,9 +27,9 @@
       "q3": [ 3, 4, 3 ],
       "lowerfence": [ 0, 1, 0 ],
       "upperfence": [ 4, 5, 4 ],
-      "mean": [ 2.2, 2.8, 2.2 ],
-      "sd": [ 0.4, 0.4, 0.4 ],
-      "notchspan": [ 0.2, 0.1, 0.2 ]
+      "mean": [ 2.2, 2.8, "2.2" ],
+      "sd": [ "0.4", 0.4, 0.4 ],
+      "notchspan": [ 0.2, "0.1", 0.2 ]
     },
     {
       "type": "box",