size of stbi__zdist_extra in stb_image.h

[rds1983]

I work upon porting stb libs to other languages and have a small question regarding this line:

static const int stbi__zdist_extra[32] =
{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};

There are only 30 values in the initializer list, while the array's declared size is 32.
So which size is correct: 30 or 32?
If it is 32, then what are the last two values? zeroes?

[nothings]

The definition of DEFLATE defines 30 entries in that table. It is unclear if there is a reason the array is declared as 32 long. The C code will initialize the extra values to 0.

[rds1983]

Thanks!