fix: remove unnecessary casts, rounding from series.estimate

Signed-off-by: Evan Prodromou <[email protected]>

app/src/util/series.ts

@@ -19,27 +19,27 @@ export function estimate(series: { year: number, value: number }[], year: number
     if (!next) {
       return null
     }
-    let rate = (1.0 * (next.value - first.value)) / (next.year - first.year);
+    let rate = (next.value - first.value) / (next.year - first.year);
     let value = first.value - rate * (first.year - year)
-    return Math.round(value)
+    return value
   } else if (year > series[series.length - 1].year) { // extrapolate forwards
     let last = series[series.length - 1]
     let prev = series.findLast(e => last.year - e.year >= year - last.year)
     if (!prev) {
       return null
     }
-    let rate = (1.0 * (last.value - prev.value)) / (last.year - prev.year);
+    let rate = (last.value - prev.value) / (last.year - prev.year);
     let value = last.value + rate * (year - last.year)
-    return Math.round(value)
+    return value
   } else { // interpolate
     let prev = series.findLast(e => e.year < year)
     let next = series.find(e => e.year > year)
     if (!prev || !next) {
       return null
     }
-    let rate = (1.0 * (next.value - prev.value)) / (next.year - prev.year);
+    let rate = (next.value - prev.value) / (next.year - prev.year);
     let value = prev.value + rate * (year - prev.year)
-    return Math.round(value)
+    return value
   }
 
   return null;