---
assert(text == null || (text.length == 5 && text.lowercase() == text))
       |    |           |    |      |       |    |           |  |
       |    |           |    |      |       |    |           |  Hello
       |    |           |    |      |       |    |           false
       |    |           |    |      |       |    hello
       |    |           |    |      |       Hello
       |    |           |    |      true
       |    |           |    5
       |    |           Hello
       |    false
       Hello
---
