Normalize wait value to nonzero integer

Author: mattt

lib/predictions.js

@@ -27,7 +27,8 @@ async function createPrediction(options) {
   const headers = {};
   if (wait) {
     if (typeof wait === "number") {
-      headers["Prefer"] = `wait=${wait}`;
+      const n = Math.max(1, Math.ceil(Number(wait)) || 1);
+      headers["Prefer"] = `wait=${n}`;
     } else {
       headers["Prefer"] = "wait";
     }