Fix costly potential value-init in parser

CHANGELOG.md

@@ -3,6 +3,8 @@ Version 66:
 * string_param optimizations
 * Add serializer request/response aliases
 * Make consuming_buffers smaller
+* Fix costly potential value-init in parser
+* Fix unused parameter warning
 
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include/beast/core/detail/static_string.hpp

@@ -119,6 +119,7 @@ template<
 CharT*
 raw_to_string(CharT* last, std::size_t size, Integer i)
 {
+    boost::ignore_unused(size);
     BOOST_ASSERT(size >= max_digits(sizeof(Integer)));
     return raw_to_string<CharT, Integer, Traits>(
         last, i, std::is_signed<Integer>{});

include/beast/http/parser.hpp

@@ -67,7 +67,12 @@ public:
         message<isRequest, Body, basic_fields<Allocator>>;
 
     /// Constructor (default)
-    parser() = default;
+    parser()
+    {
+        // avoid `parser()=default` otherwise value-init
+        // for members can happen (i.e. a big memset on
+        // static_buffer_n).
+    }
 
     /// Copy constructor (disallowed)
     parser(parser const&) = delete;