@NotNull
  @Contract(pure = true)
  public static CharSequence convertLineSeparators(@NotNull CharSequence text, @NotNull String newSeparator) {
    return unifyLineSeparators(text, newSeparator, null, false);
  }
@NotNull
  @Contract(pure = true)
  public static CharSequence convertLineSeparators(@NotNull CharSequence text, @NotNull String newSeparator)