code: public ConfigBuilder<T> withUnsafe(Property<?> property, Object value) {
          String key = String.format("%s.%s", this.namespace, property.getName());
          this.properties.setProperty(key, value.toString());
          return this;
      }
docs: Includes the given property and its value in the builder, without Property-Value type-enforcement.
  
  @param property The property to set.
  @param value    The value of the property.
  @return This instance.