Dapper.Contrib Update ignores mapping

Hi,

some fields in my table have underscores like full_name so i did
DefaultTypeMap.MatchNamesWithUnderscores = true;
which works just fine when i retrieve entity with Get<> but throws "Invalid column name 'FullName'."
when i update

my model

public class SmUser{
        public int Id { get; set; } 
        public string Name { get; set; }    
        public string FullName { get; set; }   
        public string Email { get; set; }        
    }

Whet i run Get it works just fine, the property FullName is populated with data
var user = cn.Get<SmUser>(id);

but when i update the entity

user.Email = user.Email + "z";
cn.Update(user);

i get
An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code
"Invalid column name 'FullName'."

and the sql query
update smuser set [Name] = @Name, [FullName] = @FullName, [Email] = @Email where [Id] = @Id

"FullName" is the entity property, "full_name" is the db field
using dapper 1.42

Reproduce the issue through the Get and Update entry points using the shown SmUser model and underscore-named database field. Compare the mapping used for retrieval with the SQL generated by Update, then verify that updating the entity targets the existing full_name column instead of FullName.