issue struct type ffi using fixed buffer size

[YOSSTM]

hello all,

I have an example of c struct

struct example {
char data[33];}

//with ffi I tried
export const example= StructType({
data: ArrayType('char', 33),})

but I got a wrong result in the console like "data":[48,54,54,65,70,70,53,51,53,49,53,53,56,55,56,50,56,49,48,51,52,57,52,57,0,0,0,0,0,0,0,0,0] and I have to get 
"data":066AFF535155878281034949