This seems like a bug in Library to me:
Working example:
matx1 := matrix([[0,x1],[0,0]]) :: Matrix(Expression(Integer))
lib := library("mat.lib")
lib.'matx1 := matx1;
lib.'matx1
Failing to read back when somehow when there is a non-trivial kernel in the
matrix, like sqrt(x), or exp(x), etc..
matx1 := matrix([[0,sqrt(x1)],[0,0]]) :: Matrix(Expression(Integer))
lib := library("mat.lib")
lib.'matx1 := matx1;
lib.'matx1
lib.'matx1
>> System error:
illegal sharp macro character: #\<
Line: 139465, Column: 32, File-Position: 13113927
Stream: #<SB-SYS:FD-STREAM for "file /home/tobias/mat.lib/index.KAF"
{1003932393}>
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