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Gets previous power-of-2. 🏃 [:vhs:] 📦 🌔 📒
Similar: log2, pow2, isPow2, nextPow2.
integer.prevPow2(x); // x: an int32
const integer = require('extra-integer'); integer.prevPow2(63); // 32 integer.prevPow2(128); // 128 integer.prevPow2(1); // 1