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"With a sufficient number of users of an API,

it does not matter what you promise in the contract:

all observable behaviors of your system

will be depended on by somebody."

Corollary:

If your programming language supports reflection, people will depend on private properties and methods regardless of what you do.

People who can't accomplish something with an API because things are kept private won't be users.

It is always better to get the authors of the API to provide a supported way of doing something, rather than trying to bypass the interface. That requires human skills rather than computer skills though.

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