In case of a numeric user name or user group, GroupsOf or UsersOf sequences return nothing

[gregory-vorbe]

This is due to the related FS transactions.
For example:
project=lib_FullSyncGrp
connector=c8ofullsyncgrp
transaction=GetGroupsByUser

<?xml version="1.0" encoding="ISO-8859-1"?><input>
    <transaction-variables strictMode="true">
        <variable name="_use_key" value="0020001068"/>
    </transaction-variables>
    <transaction-headers/>
    <javelin-action/>
    <webviewer-action/>
</input>

<couchdb_output type="object">
    <_c8oMeta type="object">
        <headers type="object">
            <Cache_Control originalKeyName="Cache-Control" type="string">must-revalidate</Cache_Control>
            <Content_Length originalKeyName="Content-Length" type="string">54</Content_Length>
            <Content_Type originalKeyName="Content-Type" type="string">application/json</Content_Type>
            <Date type="string">Wed, 09 Dec 2020 11:20:40 GMT</Date>
            <Server type="string">CouchDB/2.3.1 (Erlang OTP/19)</Server>
            <X_Couch_Request_ID originalKeyName="X-Couch-Request-ID" type="string">2db2434cf0</X_Couch_Request_ID>
            <X_CouchDB_Body_Time originalKeyName="X-CouchDB-Body-Time" type="string">0</X_CouchDB_Body_Time>
        </headers>
        <reasonPhrase type="string">Bad Request</reasonPhrase>
        <status type="string">client error</status>
        <statusCode type="integer">400</statusCode>
    </_c8oMeta>
    <error type="string">bad_request</error>
    <reason type="string">invalid UTF-8 JSON</reason>
</couchdb_output>

It works if variable value is surrounded by double quotes.