Add reproducer

Author: mborland

test/Jamfile

@@ -54,6 +54,7 @@ run github_issue_799.cpp ;
 run github_issue_802.cpp ;
 run github_issue_805.cpp ;
 run github_issue_808.cpp ;
+run github_issue_900.cpp ;
 run link_1.cpp link_2.cpp link_3.cpp ;
 run quick.cpp ;
 run random_decimal32_comp.cpp ;

test/github_issue_900.cpp

@@ -0,0 +1,36 @@
+// Copyright 2025 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/decimal.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::decimal;
+
+template <typename Dec>
+void to_chars_helper()
+{
+    const Dec default_value;
+    char buffer[64];
+
+    const auto r = to_chars(buffer, buffer + sizeof(buffer), default_value);
+
+    if (BOOST_TEST(r))
+    {
+        *r.ptr = '\0';
+        BOOST_TEST_CSTR_EQ(buffer, "0.0e+00");
+    }
+}
+
+int main()
+{
+    to_chars_helper<decimal32>();
+    to_chars_helper<decimal64>();
+    to_chars_helper<decimal128>();
+
+    to_chars_helper<decimal32_fast>();
+    to_chars_helper<decimal64_fast>();
+    to_chars_helper<decimal128_fast>();
+
+    return boost::report_errors();
+}