Prepare statement with type CURSOR_TYPE_READ_ONLY adds a lot of zero at the end of real numbers

When executing a MTR case:

set @arg= 1.1;

select @arg;

with cursor protocol ("--cursor-protocol"), an incorrect result is produced (a lot of zero at the end):

@arg

1.10000000000000000000000000000000000000

By default or with "--ps-portocol" it gives correct result:

@arg

1.1