return upgradedProperties.stream()
                .distinct()
                .collect(ImmutableList.toImmutableList());
        } catch (IOException e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }
    }

    /**
     * Automatically accept changes that are valid property upgrades of a getter or setter.
     *
     * Here we automatically accept the following cases:

                } else {
                    return true; // not a package-info.java file, we ignore it
                }
            } catch (IOException e) {
                throw UncheckedException.throwAsUncheckedException(e, true);
            }
        }

        private String getPackageName(File file) throws IOException {
            try (Stream<String> lines = Files.lines(file.toPath())) {