message: lipstick: added assertion message
diff: @@ -8251,7 +8251,8 @@ class basic_json
  return;
  }
  - static_assert(std::numeric_limits<NumberType>::digits10 <= s_capacity, "");
  + static_assert(std::numeric_limits<NumberType>::digits10 <= s_capacity,
  + "unexpected NumberType");
  const bool is_neg = x < 0;
  size_t i = 0;
  @@ -8283,7 +8284,8 @@ class basic_json
  }
  static constexpr auto d = std::numeric_limits<NumberType>::digits10;
  - static_assert(d == 6 or d == 15 or d == 16 or d == 17, "");
  + static_assert(d == 6 or d == 15 or d == 16 or d == 17,
  + "unexpected NumberType");
  static constexpr auto fmt = d == 6 ? "%.7g"
  : d == 15 ? "%.16g"
  