convenient way to handle "break on wrong value" sequences

[enwony]

There are some formats that rely on non-magic field to detect if sequence if exausted.

For example, this ksy:

meta:
  id: test
  file-extension: test
  endian: le

seq:
  - id: sequence
    repeat: until
    repeat-until: _.type != 0xBABECAFE
    type: myrecord
    
  - id: data
    size-eos: true

types:
  myrecord:
    seq:
    - id: type
      type: u4
    
    - id: value
      type: u4

for this file:

0xBABECAFE 
0x0000000001
0xBABECAFE
0x0000000001
...rest of data...

one additional myrecord consumed from rest of data
workaround is to parse such cases manually
how can I handle it in more convenient way?
could I use new valid expression?

[generalmimon]

@enwony I believe this has been already suggested in #156 (and #625, which I've already marked as a duplicate of #156) - please continue the discussion there if this is the case.

[enwony]

I hoped than valid expression somehow can handle this