add comment about number coercion

Author: glennsl

packages/@rescript/runtime/Stdlib_Float.res

@@ -60,7 +60,7 @@ external toStringWithRadix: (float, ~radix: int) => string = "toString"
 
 let fromString: string => option<float> = %raw(`str => {
   if (!str || !str.trim()) return;
-  let num = +str;
+  let num = +str; // Number coercion, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#number_coercion
   return isNaN(num) ? undefined : num;
 }`)
 

packages/@rescript/runtime/lib/es6/Stdlib_Float.js

@@ -5,7 +5,7 @@ let Constants = {};
 
 let fromString = (str => {
   if (!str || !str.trim()) return;
-  let num = +str;
+  let num = +str; // Number coercion, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#number_coercion
   return isNaN(num) ? undefined : num;
 });
 

packages/@rescript/runtime/lib/js/Stdlib_Float.js

@@ -5,7 +5,7 @@ let Constants = {};
 
 let fromString = (str => {
   if (!str || !str.trim()) return;
-  let num = +str;
+  let num = +str; // Number coercion, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#number_coercion
   return isNaN(num) ? undefined : num;
 });