spawn: permit using IOBuffer as stdout #52461
Merged
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People expect to use this (the docs even almost even suggested it at some point), so it is better to make it work as expected (and better than they can emulate) than to criticize their choices.
Also fix a few regressions and handling mistakes in setup_stdios:
check_open
calls before writing, and ignoredBase.reseteof
as a possible means of resuming writing afterclosewrite
sends a shutdown message. Currently this fix is disabled because Pkg seems like a bit of a disaster with IO mismanagement.closewrite
to more methods, and document it.Fixes #39311
Fixes #49234
Closes #49233
Closes #46768