The issue: sum of msize with fsize would double the data space with a new call to createjmf_jmf_ .  Due to shape, results instead in a cd domain error.  Work around, use {. msize + fsize .

   require'jmf'
   (,: $L:0) _ _2{. showmap_jmf_''
+-----+----+
|msize|refs|
+-----+----+
|100  |2   |
+-----+----+

+-----+----+
|5    |4   |
+-----+----+
|1    |1   |
+-----+----+

   JVERSION
Engine: j902/j64/linux
Release-a: commercial/2020-12-05T11:11:55
Library: 9.02.08
Platform: Linux 64
Installer: unknown
InstallPath: /usr/share/j/9.02
Contact: www.jsoftware.com


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