Seal popover fields.

1 files changed, 2 insertions, 2 deletions

diff --git a/main.js b/main.js
index 102e489..3455e46 100644
--- a/main.js
+++ b/main.js
@@ -3686,9 +3686,9 @@ const disposePopover = (function() {
   const mkFieldMap = function(fieldMap) {
     return Object.fromEntries(Object.entries(fieldMap).map(function([k, o]) {
       if (typeof o === 'string') {
-        return [k, {key: k, desc: o}];
+        return [k, Object.seal({key: k, desc: o})];
       } else {
-        return [k, Object.assign(o, {key: k})];
+        return [k, Object.seal(Object.assign(o, {key: k}))];
       }
     }));
   };