[datatable-help] Filter rows using integer64 columns

[tjonesd289]

I have loaded data from file. The resulting data.table looks like this:  
> require(data.table)  
>require(bit64)
> z = fread('mydata.csv')  
> print(z)  
                      a  
1:  -688037432807398365  
2:  8910419692287774511  
3:  7392641969610778497  
4: -7275864368241016399  
5:  5280275646239497580  

> class(z$a)
"integer64"

However, I cannot filter z on column a...  
> z[a == -688037432807398365,]  
Empty data.table (0 rows) of 1 cols: a  

Similarly,
> z[a == as.integer64(-688037432807398365),]  
Error in UseMethod("as.data.table") :  
  no applicable method for 'as.data.table' applied to an object of class
"integer64"  
  
I also noticed that as.integer64 rounds the input (see last 3 digits)....  
> as.integer64(-688037432807398365)  
integer64  
[1] -688037432807398400  

Any ideas how to  filter rows using integer64 columns? I suppose I could
convert to character first, but then what is the point of even having
integer64?

datatable is version 1.9.4, bit64 is version 0.9-5  
  
Thanks!  
  



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