Handle i32::MIN in Number::two_pow and Number::ten_pow (#771)

* In Number::two_pow, handle i32::MIN case

* In Number::ten_pow, handle i32::MIN case

Author: jaylorch

src/number.rs

@@ -781,7 +781,8 @@ impl Number {
         if e >= 0 {
             Ok(two_pow_positive(e as u32))
         } else {
-            let denom = two_pow_positive((-e) as u32);
+            // Must cast to i64 before negating in case it's i32::MIN
+            let denom = two_pow_positive((-(e as i64)) as u32);
             Number::from(1u64).divide(&denom)
         }
     }
@@ -790,7 +791,8 @@ impl Number {
         if e >= 0 {
             Ok(ten_pow_positive(e as u32))
         } else {
-            let denom = ten_pow_positive((-e) as u32);
+            // Must cast to i64 before negating in case it's i32::MIN
+            let denom = ten_pow_positive((-(e as i64)) as u32);
             Number::from(1u64).divide(&denom)
         }
     }