What replaced mergeResults="true"?

[Klingenstein, Nate]

Helping out with a configuration transliteration and I'm stuck on:

WARN [net.shibboleth.idp.attribute.resolver.spring.dc.ldap.impl.LDAPDataConnectorParser$V2Parser:245] - mergeResults property no longer supported

It looks like it might be a one-for-one replacement with multipleResultsIsError:

https://wiki.shibboleth.net/confluence/display/IDP30/LDAPConnector
https://wiki.shibboleth.net/confluence/display/SHIB2/ResolverLDAPDataConnector

But, I'm not sure what the default behavior of the LDAP connector in v3 is when it encounters multiple results.

Couldn't find the answer archived, and apologies if I missed it, but rather than reading code and actually learning, I'll ask here for posterity.  Is it first record wins, or merge, or something else?  Configurable?