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"Exceptional Situations:

Should be prepared to signal an error of type type-error if sequence is not=
 a proper sequence. Should signal an error of type type-error if start is n=
ot a non-negative integer. Should signal an error of type type-error if end=
 is not a non-negative integer or nil.=20

Might signal an error of type type-error if an element read from the stream=
 is not a member of the element type of the sequence."

So basically it doesn't say anything about being restricted to only ascii s=
tream. Only if the types of stream and sequence aren't matching then it cou=
ld signal an error. And Imago is using type '(unsigned-byte 8) for both str=
eam and sequence so it should work in all accounts.

So it would mean that:

read-char reads char
read-byte reads binary
read-sequence reads char and binary

Jyrki