DynamicJsonDocument reallocates memory pool is it's too small

src/ArduinoJson/Document/JsonDocument.hpp

@@ -63,6 +63,9 @@ class JsonDocument : public Visitable {
   }
 
  protected:
+  JsonDocument(MemoryPool pool)
+      : nestingLimit(ARDUINOJSON_DEFAULT_NESTING_LIMIT), _pool(pool) {}
+
   JsonDocument(char* buf, size_t capa)
       : nestingLimit(ARDUINOJSON_DEFAULT_NESTING_LIMIT), _pool(buf, capa) {}
 
@@ -71,6 +74,10 @@ class JsonDocument : public Visitable {
     to<VariantRef>().set(src.as<VariantRef>());
   }
 
+  void replacePool(MemoryPool pool) {
+    _pool = pool;
+  }
+
  private:
   VariantRef getVariant() {
     return VariantRef(&_pool, &_data);