diff --git a/README.md b/README.md
index 230cd61..7a4c2de 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 [![windows-msys2-clang](https://github.com/red0124/ssp/workflows/win-msys2-clang-ci/badge.svg)](https://github.com/red0124/ssp/actions/workflows/win-msys2-clang.yml)
 [![win-msvc-ci](https://github.com/red0124/ssp/workflows/win-msvc-ci/badge.svg)](https://github.com/red0124/ssp/actions/workflows/win-msvc.yml)
 [![single-header-ci](https://github.com/red0124/ssp/workflows/single-header-ci/badge.svg)](https://github.com/red0124/ssp/actions/workflows/single-header.yml)
-[![coverage](https://coveralls.io/repos/github/red0124/ssp/badge.svg?branch=feature/coverage_ci)](https://coveralls.io/github/red0124/ssp?branch=feature/coverage_ci)
+[![coverage](https://coveralls.io/repos/github/red0124/ssp/badge.svg?branch=master/coverage_ci)](https://coveralls.io/github/red0124/ssp?branch=master/coverage_ci)
 
 A header only "csv" parser which is fast and versatile with modern C++ api. Requires compiler with C++17 support. [Can also be used to convert strings to specific types.](#the-converter)
 
diff --git a/include/ss/extract.hpp b/include/ss/extract.hpp
index 4862f3f..a26828d 100644
--- a/include/ss/extract.hpp
+++ b/include/ss/extract.hpp
@@ -16,7 +16,6 @@
 #include <cstdlib>
 #endif
 
-// TODO try from_chars for integer conversions
 namespace ss {
 
 ////////////////
diff --git a/include/ss/parser.hpp b/include/ss/parser.hpp
index 54126bb..db80dd3 100644
--- a/include/ss/parser.hpp
+++ b/include/ss/parser.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-// TODO add single header tests
 #include "common.hpp"
 #include "converter.hpp"
 #include "exception.hpp"
diff --git a/ssp.hpp b/ssp.hpp
index d50d3c3..cb0bc2e 100644
--- a/ssp.hpp
+++ b/ssp.hpp
@@ -1465,7 +1465,6 @@ public:
 #else
 #endif
 
-// TODO try from_chars for integer conversions
 namespace ss {
 
 ////////////////
@@ -1491,17 +1490,24 @@ std::enable_if_t<std::is_floating_point_v<T>, std::optional<T>> to_num(
 template <typename T>
 std::enable_if_t<std::is_floating_point_v<T>, std::optional<T>> to_num(
     const char* const begin, const char* const end) {
+    static_assert(!std::is_same_v<T, long double>,
+                  "Conversion to long double is disabled");
+
     constexpr static auto buff_max = 64;
-    char buff[buff_max];
+    char short_buff[buff_max];
     size_t string_range = std::distance(begin, end);
+    std::string long_buff;
 
+    char* buff;
     if (string_range > buff_max) {
-        return std::nullopt;
+        long_buff = std::string{begin, end};
+        buff = long_buff.data();
+    } else {
+        buff = short_buff;
+        buff[string_range] = '\0';
+        std::copy_n(begin, string_range, buff);
     }
 
-    std::copy_n(begin, string_range, buff);
-    buff[string_range] = '\0';
-
     T ret;
     char* parse_end = nullptr;
 
@@ -1509,8 +1515,6 @@ std::enable_if_t<std::is_floating_point_v<T>, std::optional<T>> to_num(
         ret = std::strtof(buff, &parse_end);
     } else if constexpr (std::is_same_v<T, double>) {
         ret = std::strtod(buff, &parse_end);
-    } else if constexpr (std::is_same_v<T, long double>) {
-        ret = std::strtold(buff, &parse_end);
     }
 
     if (parse_end != buff + string_range) {
@@ -2132,7 +2136,6 @@ private:
 
 } /* ss */
 
-// TODO add single header tests
 
 namespace ss {