Escaping references is a way to protect the data from being polluted.
fx: when returning a list of users from a class; even the list is encapsulated, but the reference to the list may be exposed to external after returning the same list to the external. On the case, the content may be modified by an external process.
There are two ways to escape the reference:
1. not returning an instance reference directly; fx. returning un-modified collections(immutable).
2. using the interface to customise the data model that is only readable.
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