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Closes #1, #2, #4 et #5

See merge request !1

FOR DEVS I strongly advise you turn "fix on save" param for eslint on vscode

Closes #4

Get rid of check equality parameter which would kind of wreck the
principle of hierarchy.
And turn function in a more idiomatic implementation, using
Express's middleware chain system.

Permissions Closes #3

Closes #3

See merge request !3

Place callback as last parameter
And checkEquality is now required

Authentication

See merge request !2

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