Dear list,

it seems as if there are braces missing in the definition of \buff_save around 
#2.

\def\buff_save[#1][#2]%
  {...
    {\setupcurrentsavebuffer[\c!list={#1},\c!file=#2]}%
  ...}

I think they are missing, because it makes the following work, even though 
arguments and key-value arguments shouldn't be mixed up.

\startbuffer[hash]
foo
\stopbuffer
\savebuffer[hash][hello.txt,prefix=no]
\starttext
\stoptext

I think you should either make a third argument for a key-value list or just 
make the second argument the key-value list.  Then users could input 
\savebuffer[hash][file=hello.txt,prefix=no].

Cheers, Henri
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