Remove trailing zeros

include/fmt/format.h

@@ -1213,6 +1213,8 @@ It grisu2_prettify(const char* digits, int size, int exp, It it,
     if (params.num_digits >= 0 && params.num_digits < num_zeros)
       num_zeros = params.num_digits;
     it = std::fill_n(it, num_zeros, static_cast<Char>('0'));
+    if (!params.trailing_zeros)
+      while (size > 0 && digits[size - 1] == '0') --size;
     it = copy_str<Char>(digits, digits + size, it);
   }
   return it;

test/format-test.cc

@@ -1488,6 +1488,7 @@ TEST(FormatterTest, PrecisionRounding) {
   EXPECT_EQ("0.002", format("{:.3f}", 0.0015));
   EXPECT_EQ("1.000", format("{:.3f}", 0.9999));
   EXPECT_EQ("0.00123", format("{:.3}", 0.00123));
+  EXPECT_EQ("0.1", format("{:.16g}", 0.1));
   // Trigger rounding error in Grisu by a carefully chosen number.
   auto n = 3788512123356.985352;
   char buffer[64];