support discarding tags, not just keys

lib/build.js

@@ -668,15 +668,20 @@ function generateTaginfo(presets, fields, deprecated, discarded, tstrings, proje
   });
 
   if (!discarded) discarded = {};
-  Object.keys(discarded).forEach(key => {
+  for (const key in discarded) {
     let description = '🄳🄳 (discarded tag)';
-    /** @type {TaginfoTag} */
-    let tag = {
-      key,
-      description: [description]
-    };
-    coalesceTags(taginfo, tag);
-  });
+    if (discarded[key] === true) {
+      // key=*
+      let tag = { key, description: [description] };
+      coalesceTags(taginfo, tag);
+    } else {
+      // key=value
+      for (const value in discarded[key]) {
+        const tag = { key, value, description: [description] };
+        coalesceTags(taginfo, tag);
+      }
+    }
+  }
 
   taginfo.tags.forEach(elem => {
     if (elem.description) {

schemas/discarded.json

@@ -2,9 +2,16 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "$id": "https://github.com/ideditor/schema-builder/raw/main/schemas/discarded.json",
     "title": "Discarded tags",
-    "description": "Keys of tags to be deleted when editing features.",
+    "description": "Keys or tags to be deleted when editing features.",
     "type": "object",
     "additionalProperties": {
-        "type": "boolean"
+      "anyOf": [
+        { "type": "boolean", "enum": [true] },
+        {
+          "type": "object",
+          "additionalProperties": { "type": "boolean", "enum": [true] },
+          "minProperties": 1
+        }
+      ]
     }
 }