From cfa19a60ba2cf11c715ec40ce6623d63e3cdce55 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sun, 22 Aug 2021 13:53:22 +0200
Subject: [PATCH] abacus: bignum: trim zeros after a subtraction

This way we keep a canonicalized version of the result.
---
 src/bignum/bignum.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/bignum/bignum.cc b/src/bignum/bignum.cc
index abf0b5f..ffceaa9 100644
--- a/src/bignum/bignum.cc
+++ b/src/bignum/bignum.cc
@@ -82,6 +82,8 @@ digits_type do_substraction(digits_type const& lhs, digits_type const& rhs) {
     std::transform(complement.begin(), complement.end(), complement.begin(),
                    take_complement);
 
+    do_trim_leading_zeros(complement);
+
     return complement;
 }