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> For example, I would expect the same padding for 'BT{I}' and 'BI'.
Granted, yes. But I wouldn't expect the same padding for 'BT{BI}' and 'BBI'. 'BT{BI}' should match a C struct which itself has an embedded struct. For C, I get the following results on my machine:
#include <stdio.h>
/* corresponds to 'T{BI}' */
typedef struct {
 char y;
 int z;
} A;
/* corresponds to 'BT{BI}' */
typedef struct {
 char x;
 A yz;
} B;
/* corresponds to 'BBI' */
typedef struct {
 char x;
 char y;
 int z;
} C;
int main(void) {
 printf("sizeof(A) = %zu\n", sizeof(A));
 printf("sizeof(B) = %zu\n", sizeof(B));
 printf("sizeof(C) = %zu\n", sizeof(C));
 return 0;
}
/* 
Results on a (64-bit) OS X 10.6 machine: 
 
sizeof(A) = 8 
sizeof(B) = 12 
sizeof(C) = 8 
*/