>>  string = 'a string'
>>  copy = string
>>  string.replace 'a different string'

>>  ...because the real code requires the changer of the string to know that
>>  there is going to be a copy made of the string.

For me, Object#clone or Object#dup works:

string = 'a string'
copy = string.clone
string = 'a different string'

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