[cc65] Constant initializers

Why does this work?

asm.s:

.EXPORT _data = *

.BYTE 1,2,3,4,5

.EXPORT _data_size = *-_data

main1.c:

extern unsigned char data[];
extern void data_size;

void main(void)
{
  static unsigned int ds = (unsigned int)&data_size;
}

and this not (non constant initializer error):

main2.c:

extern unsigned char data[];
extern void data_size;

void main(void)
{
  static unsigned char ds = (unsigned char)&data_size;
}
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