Gets first entry from object (default order).
[k₀, v₀] if x ≠ Φ else ed | [k₀, v₀] ∈ x
an object
default entry
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Gets first entry from object (default order).
Returns
[k₀, v₀] if x ≠ Φ else ed | [k₀, v₀] ∈ x