User "^demon" posted a comment on MediaWiki.r101644.

Full URL: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/101644#c25874
Commit summary:

(bug 31822) Error during upgrade due to output buffer reset in stdout.

In various places in Maintenance, we're overwriting our output buffer rather 
than appending to it. This doesn't matter too much in the CLI, but it can 
corrupt headers when upgrading from the web. Thanks Woozle for pointing this 
out.

Comment:

The main difference was so I could differ stderr vs. stdout. But I suppose as a 
practical concern it doesn't really matter.

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