double_quotes doesnt return codes in SWI-Prolog

I'm using SWI-Prolog 5.4.7, i've read the manual and the default
behaviour for double_quotes is to return the code i.e "A" -> 65.
This works if I'm using the Prolog prompt but in my code, it doesnt,
I've tried setting it set_prolog_flag(double_quotes,codes)
it doesnt work, I've tried setting it to all the other possible values,
nothing works.

Here's my code:

read_entrys("@",Stream) :- % after @, read in the type
!, get0(Stream,C), read_type(C,Stream).
read_entrys(_C,Stream) :- % ignore anything else
read_entrys(Stream).

The first clause never unifies.
I don't want to resort to read_entrys(64,Stream) ...

.

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