For example, when iterating over a list, now we use a native integerfor the index (which is not exposed to the user). Previously we usedtagged integers, but in these use cases they provide no real benefit.This simplifies the IR and should slightly improve performance, as fewertagged int to native int conversions are needed.Multiple ops have to be migrated in one go, as these interact witheach other, and by only changing a subset of them would actuallygenerate more verbose IR, as a bunch of extra coercions would beneeded.List of impacted statements: * For loop over sequence * Assignment like `x, y = a` for tuple/list rvalue * Dict iteration * List comprehensionFor example, consider this example:```def foo(a: list[int]) -> None:    for x in a:        pass```Old generated IR was like this:```def foo(a):    a :: list    r0 :: short_int    r1 :: ptr    r2 :: native_int    r3 :: short_int    r4 :: bit    r5 :: native_int    r6, r7 :: ptr    r8 :: native_int    r9 :: ptr    r10 :: object    r11 :: int    r12 :: short_int    r13 :: NoneL0:    r0 = 0L1:    r1 = get_element_ptr a ob_size :: PyVarObject    r2 = load_mem r1 :: native_int*    r3 = r2 << 1    r4 = r0 < r3 :: signed    if r4 goto L2 else goto L5 :: boolL2:    r5 = r0 >> 1    r6 = get_element_ptr a ob_item :: PyListObject    r7 = load_mem r6 :: ptr*    r8 = r5 * 8    r9 = r7 + r8    r10 = load_mem r9 :: builtins.object*    inc_ref r10    r11 = unbox(int, r10)    dec_ref r10    if is_error(r11) goto L6 (error at foo:2) else goto L3L3:    dec_ref r11 :: intL4:    r12 = r0 + 2    r0 = r12    goto L1L5:    return 1L6:    r13 = <error> :: None    return r13```Now the generated IR is simpler:```def foo(a):    a :: list    r0 :: native_int    r1 :: ptr    r2 :: native_int    r3 :: bit    r4, r5 :: ptr    r6 :: native_int    r7 :: ptr    r8 :: object    r9 :: int    r10 :: native_int    r11 :: NoneL0:    r0 = 0L1:    r1 = get_element_ptr a ob_size :: PyVarObject    r2 = load_mem r1 :: native_int*    r3 = r0 < r2 :: signed    if r3 goto L2 else goto L5 :: boolL2:    r4 = get_element_ptr a ob_item :: PyListObject    r5 = load_mem r4 :: ptr*    r6 = r0 * 8    r7 = r5 + r6    r8 = load_mem r7 :: builtins.object*    inc_ref r8    r9 = unbox(int, r8)    dec_ref r8    if is_error(r9) goto L6 (error at foo:2) else goto L3L3:    dec_ref r9 :: intL4:    r10 = r0 + 1    r0 = r10    goto L1L5:    return 1L6:    r11 = <error> :: None    return r11```

for more information, seehttps://pre-commit.ci