text original = "Yellow world"
text ref = original # copying the reference
text copied = *original # copying the content
original[0] = "H" # texts are indexable and mutable
original[5] = ","
ref.append("!") # texts are coercible and growable
copied += "?"
^|
 | original == ref == "Hello, world!"
 | copied == "Yellow world?"
 |^