Hello,

I just found out about this library today and I was just trying things out. Overall I was able to get things working, however, there are some serialization/deserialization behaviors I would like to customize, but couldn't figure out how from the documentation.

For reference, my code is effectively doing the following:

// deserialization
auto content = c4::to_csubstr(data);  // convert from std::string_view to c4::csubstr
T obj;  // T is a scalar type like int, char, double, etc.
auto tree = ryml::parse_in_arena(content);
tree.rootref() >> obj;

// serialization
ryml::Tree out_tree;
out_tree.rootref() << obj;

std::ostream ostream(&buf);  // buf is a boost IO stream buffer that writes to a std::string
ostream << out_tree;

By trying various scalar values, what I noticed is that:

• If I pass in a negative number like -123 or -2.35e-10, the serialized output string is always quoted with single quotes, like '-123' and '-2.35e-10'
• If I pass in a single space character with single quotes like ' ', the output is a double quoted string like " "
• If I pass in a number with a plus sign like +123 or +3.5e+6, it raises an exception.
• As far as I can tell from documentation, there is no overflow/underflow detection by default, but I couldn't figure out how.

I was wondering if I can tweak the parsing behavior, so that:

• for numbers, don't add any quotes.
• If it adds quotes around scalars, at least be consistent (either always use single quotes or double quotes).
• Ideally, support parsing the + sign in front of ints or doubles
• enable overflow/underflow detection.

Is it possible to customize the library with these changes, or do I need to use some adaptor/intermediate custom type tricks to do these customizations? If I do need to use adaptors/custom types, is there some examples that I can look at? Thanks!