pgj commented on PR #4810:
URL: https://github.com/apache/couchdb/pull/4810#issuecomment-1787413943
It is the derived string upper limit that does not work. Consider the
following:
```erlang
> Lower = <<"A">>.
<<"A">>.
> Upper = <<Lower/binary, 16#10FFFF>>.
<<"A\377">>.
```
On CentOS 7:
```erlang
> couch_ejson_compare:get_icu_version().
{50,2,0,0}
> couch_ejson_compare:get_collator_version().
{58,0,6,50}
> mango_json:cmp(Lower, <<"AUS">>).
-1
> mango_json:cmp(<<"AUS">>, Upper).
1
```
On anywhere else (for example, locally):
```erlang
> couch_ejson_compare:get_icu_version().
{73,2,0,0}
> couch_ejson_compare:get_collator_version().
{153,120,0,0}
> mango_json:cmp(Lower, <<"AUS">>).
-1
> mango_json:cmp(<<"AUS">>, Upper).
-1
```
The `mango_json:cmp/2` function should return `-1` for every case. That
signals the "less than" result, which should hold for all. Apparently, `icu`
50 disagrees (as @nickva suspected) hence no documents are returned for the
range.
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