Disallow case NaN, switch(NaN), indexOf(NaN), and `lastIndexOf(…

…NaN)` (use-isnan)

Fixes: standard/standard#1429

eslintrc.json

@@ -206,7 +206,10 @@
     "template-curly-spacing": ["error", "never"],
     "template-tag-spacing": ["error", "never"],
     "unicode-bom": ["error", "never"],
-    "use-isnan": "error",
+    "use-isnan": ["error", {
+      "enforceForSwitchCase": true,
+      "enforceForIndexOf": true
+    }],
     "valid-typeof": ["error", { "requireStringLiterals": true }],
     "wrap-iife": ["error", "any", { "functionPrototypeMethods": true }],
     "yield-star-spacing": ["error", "both"],