private boolean isNullOrTrue(JsonNode nodeToCheck) {
        return nodeToCheck == null
               || nodeToCheck.isNull()
               || nodeToCheck.isBoolean() && nodeToCheck.asBoolean();
    }
Setter for "{@link SchemaKeyword#TAG_ADDITIONAL_PROPERTIES}" attribute.

@param node schema node to set attribute on
@param additionalProperties attribute value to set (sub-schema)
@param generationContext generation context, including configuration to apply when looking-up attribute values
@return this instance (for chaining)
jsonschema-generator/src/main/java/com/github/victools/jsonschema/generator/impl/AttributeCollector.java