suppressing shell history expansion in comint-previous-input

[Sean McLaughlin]

Hello,

 I'm using ocaml and often type strings like "!a;;" into comint.  When 
I do a comint-previous-input, instead of the expected "!a;;", I get "awk 
" or some other command I typed in some time ago.  I believe what is 
happening is that the shell expects the exclamation mark to be asking 
for a history expansion.  I want to suppress this behavior but can't 
figure out how to do it.  Any thoughts?

Best,

Sean