IF: Use string for variant format of fc::dynamic_bitset

libraries/libfc/include/fc/variant_dynamic_bitset.hpp

@@ -12,19 +12,20 @@ namespace fc
       if ( num_blocks > MAX_NUM_ARRAY_ELEMENTS )
          throw std::range_error( "number of blocks of dynamic_bitset cannot be greather than MAX_NUM_ARRAY_ELEMENTS" );
 
-      std::vector<fc::dynamic_bitset::block_type> blocks(num_blocks);
-      boost::to_block_range(bs, blocks.begin());
-      v = fc::mutable_variant_object("size", bs.size())
-                                    ("bits", blocks);
+      std::string s;
+      to_string(bs, s);
+      // From boost::dynamic_bitset docs:
+      //   A character in the string is '1' if the corresponding bit is set, and '0' if it is not. Character
+      //   position i in the string corresponds to bit position b.size() - 1 - i.
+      // reverse so the ith string character corresponds to the ith dynamic_bitset entry
+      std::ranges::reverse(s);
+      v = std::move(s);
    }
 
    inline void from_variant( const fc::variant& v, fc::dynamic_bitset& bs ) {
-      fc::dynamic_bitset::size_type size;
-      std::vector<fc::dynamic_bitset::block_type> blocks;
-
-      from_variant(v["size"], size);
-      from_variant(v["bits"], blocks);
-      bs = { blocks.cbegin(), blocks.cend() };
-      bs.resize(size);
+      std::string s = v.get_string();
+      // see comment above
+      std::ranges::reverse(s);
+      bs = fc::dynamic_bitset(s);
    }
 } // namespace fc