From 328ad4696c4c8e78a4db2e8af611cc5c857a924e Mon Sep 17 00:00:00 2001
From: Paul Mason <paul@paulmason.me>
Date: Wed, 21 Jul 2021 15:15:52 +1200
Subject: [PATCH] Round f64 before final conversion in to_f64

---
 src/decimal.rs         | 2 +-
 tests/decimal_tests.rs | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/decimal.rs b/src/decimal.rs
index c4103efb..f3c343ec 100644
--- a/src/decimal.rs
+++ b/src/decimal.rs
@@ -1841,7 +1841,7 @@ impl ToPrimitive for Decimal {
             let frac_f64 = (frac_part as f64) / (precision as f64);
             let value = sign * ((integral_part as f64) + frac_f64);
             let round_to = 10f64.powi(self.scale() as i32);
-            Some(value * round_to / round_to)
+            Some((value * round_to).round() / round_to)
         }
     }
 }
diff --git a/tests/decimal_tests.rs b/tests/decimal_tests.rs
index 9607517e..ca59f728 100644
--- a/tests/decimal_tests.rs
+++ b/tests/decimal_tests.rs
@@ -2457,6 +2457,9 @@ fn it_converts_to_f64() {
             None, // Cannot be represented in an f64
         ),
         ("1.59283191", Some(1.59283191_f64)),
+        ("2.2238", Some(2.2238_f64)),
+        ("2.2238123", Some(2.2238123_f64)),
+        ("22238", Some(22238_f64)),
     ];
     for &(value, expected) in tests {
         let value = Decimal::from_str(value).unwrap().to_f64();