https://git.ruby-lang.org/ruby.git/commit/?id=82f6085b3e

From 82f6085b3edaa41be4121b218b48100d4bf78670 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Wed, 6 Jan 2021 18:17:35 +0900
Subject: [ruby/bigdecimal] Fix trailing zero handling in
 rb_uint64_convert_to_BigDecimal

https://github.com/ruby/bigdecimal/commit/2056604d56

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 63de77c..72c7b34 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2736,12 +2736,15 @@ rb_uint64_convert_to_BigDecimal(uint64_t uval, RB_UNUSED_VAR(size_t digs), int r https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2736
         vp->exponent = len;
         VpSetSign(vp, 1);
 
-        size_t i;
+        size_t i, ntz = 0;
         for (i = 0; i < len; ++i) {
             DECDIG r = uval % BASE;
             vp->frac[len - i - 1] = r;
+            if (r == 0) ++ntz;
             uval /= BASE;
         }
+
+        vp->Prec -= ntz;
     }
 
     return BigDecimal_wrap_struct(obj, vp);
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 74c991f..fbe0d7e 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -1951,6 +1951,10 @@ class TestBigDecimal < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/bigdecimal/test_bigdecimal.rb#L1951
     assert_equal(1, BigDecimal(-1).precision)
     assert_equal(2, BigDecimal(10).precision)
     assert_equal(2, BigDecimal(-10).precision)
+    assert_equal(9, BigDecimal(100_000_000).precision)
+    assert_equal(9, BigDecimal(-100_000_000).precision)
+    assert_equal(12, BigDecimal(100_000_000_000).precision)
+    assert_equal(12, BigDecimal(-100_000_000_000).precision)
     assert_equal(21, BigDecimal(100_000_000_000_000_000_000).precision)
     assert_equal(21, BigDecimal(-100_000_000_000_000_000_000).precision)
     assert_equal(103, BigDecimal("111e100").precision)
-- 
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