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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <131218235723.ZM4638@torch.brasslantern.com>
Date: Wed, 18 Dec 2013 23:57:23 -0800
In-reply-to: <20131218192816.047ab5f5@pws-pc.ntlworld.com>
Comments: In reply to Peter Stephenson <p.w.stephenson@ntlworld.com>
 "Re: Read-only variables in emulation mode" (Dec 18,  7:28pm)
References:
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	<131216114013.ZM25877@torch.brasslantern.com>
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	<20131218192816.047ab5f5@pws-pc.ntlworld.com>
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Subject: Re: Read-only variables in emulation mode
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On Dec 18,  7:28pm, Peter Stephenson wrote:
} Subject: Re: Read-only variables in emulation mode
}
} On Tue, 17 Dec 2013 22:36:51 -0800
} Bart Schaefer <schaefer@brasslantern.com> wrote:
} > It's a known limitation that invoking "emulate ..." after the shell is
} > already running does [not] completely re-instantiate POSIX mode.
} 
} I don't expect I'll get round to it myself, but in the case of
} variables, I don't think this should be that difficult.

The part about "_" is easy, though:

diff --git a/Src/params.c b/Src/params.c
index 26ad6b2..cadf268 100644
--- a/Src/params.c
+++ b/Src/params.c
@@ -283,7 +283,7 @@ IPDEF2("TERM", term_gsu, 0),
 IPDEF2("TERMINFO", terminfo_gsu, PM_UNSET),
 IPDEF2("WORDCHARS", wordchars_gsu, 0),
 IPDEF2("IFS", ifs_gsu, PM_DONTIMPORT),
-IPDEF2("_", underscore_gsu, PM_READONLY),
+IPDEF2("_", underscore_gsu, PM_DONTIMPORT),
 IPDEF2("KEYBOARD_HACK", keyboard_hack_gsu, PM_DONTIMPORT),
 
 #ifdef USE_LOCALE


Feel free to commit that for me if you want it to go into 5.0.4, I'm
going to be asleep for the next several hours ...