Keep first n entries only (default order).
a map
number of entries [1]
{[k₀, v₀], [k₁, v₁], ...} | [kᵢ, vᵢ] ∈ x and |{[k₀, v₀], [k₁, v₁], ...}| ≤ n
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Keep first n entries only (default order).