Ignore identity optic when composing
#96
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In
Setfield, compose a lens withIdentityLenswill give back the lens, refhttps://github.com/jw3126/Setfield.jl/blob/e31e1e361bd6a251124aa578122e6198b81197b5/src/lens.jl#L148-L152
This behavior can't be reimplemented in
Accessorsbecauseidentityis aBasefunction.This PR is for backward compatibility.