xnor

[Undistraction]

Is your feature request related to a problem? Please describe.

Complement of nor

Describe the solution you'd like

xnor(true, true); //=> true
xnor(true, false); //=> false
xnor(false, true); //=> false
xnor(false, false); //=> true

Describe alternatives you've considered

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Additional context

Complement of nor. Is true only if both values are the same.

• T T = T
• T F = F
• F T = F
• F F = T

See: #234

[FelipeParreira]

It is actually the complement of xor(from Ramda), right?