Github user gliptak commented on the pull request:
https://github.com/apache/commons-lang/pull/103#issuecomment-120172164
@garydgregory The one reference i'm seeing is at
http://public.dhe.ibm.com/common/ssi/ecm/zs/en/zsl03071usen/ZSL03071USEN.PDF
The system property os.arch for IBM SDK for z/OS, version 1.4.2 (31-bit)
versions and earlier had a value of 390. From Java 5.0 onwards, the value of
os.arch is s390.
I'm not sure of the "z/os" reference as described at:
http://www.java2s.com/Tutorial/Java/0120__Development/ConditionthatteststheOStype.htm
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