Is the following correct?
x = "some string"
x is a reference to "some string"
foo(x)
Reference is passed to function.
In foo:
x += " change"
Strings are immutable, so x in foo() now points to a different string
than x outside foo().
Right?
Back outside foo.
x = ["some string"]
x is a reference to a list whose first element is a reference to a
string.
foo(x)
Within foo:
x[0] += " other"
Another string is created, the first element of x is modified to point
to the new string and back outside foo(), x[0] will point to the new
string.
Right?
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