Change ARRAY and OBJECT markers

[kxepal]

Short story:

Riyad Kalla had proposed to change ARRAY and OBJECT markers pairs A...E and O...E to [...] and {...} respectively.

This looks like a good idea for the next reasons:

1. UBJSON becomes closer to his father, JSON.

2. Since UBJSON is binary format, this change makes easy to read data in hex format:

   Draft 8 (v0.8) style:

   0000   4F 53 69 03 66 6F 6F 41    OSi.fooA
   0008   53 69 03 62 61 72 4F 53    Si.barOS
   0010   69 03 62 61 7A 69 2A 45    i.bazi*E
   0018   45 45                      EE

   new style:

   0000   7B 53 69 03 66 6F 6F 5B    {Si.foo[
   0008   53 69 03 62 61 72 7B 53    Si.bar{S
   0010   69 03 62 61 7A 69 2A 7D    i.bazi*}
   0018   5D 7D                      ]}

   Note, how easy to visual guess where end array or object.

3. This change completely breaks backward compatibility that is already broken by other improvements(;
4. Now we've got new type of errors as ending marker mismatch.

The main flaw of this change that it breaks pretty [ ] notation. However, as for me, if I'd like to work with binary data, I'll choose hex dump format. If I need to read the data, I prefer YAML one.

[AnyCPU]

Ref #6.

[ghost]

ACCEPTED

Merged into Draft 9 spec: http://ubjson.org/type-reference/