I'm not sure, if I get this right. This is a hack to get an ecosystem flag encoded inside the currency identifier field with the idea of "starting with 0 => real, starting with 1 => test"?
```
00000000000000000000000000000000b <> 0x00000000 <> Bitcoin (well, if we'd count it here)
00000000000000000000000000000001b <> 0x00000001 <> Mastercoin
00000000000000000000000000000010b <> 0x00000002 <> Test Mastercoin
10000000000000000000000000000000b <> 0x80000000 <> ??
10000000000000000000000000000001b <> 0x80000001 <> Test ecosystem, Mastercoin?
10000000000000000000000000000010b <> 0x80000002 <> Test ecosystem, Test Mastercoin?
10000000000000000000000000000011b <> 0x80000003 <> ??
```
The description seems to be in conflict with the valid values. 0x80000000 is 2,147,483,647 + 1 which would be outside of the allowed range.