strange behaviors in IDL MakeArray(), not reproduced in GDL

[alaingdl]

@GillesDuvert mentioned that HISTOGRAM() in IDL (#1303) gives strange result.

I report here another issue.

IDL> a=make_array(10,  /float, /long)
IDL> help, a                           
A               STRING    = Array[10]
IDL> a=make_array(10,  /float, /int) 
IDL> help, a                          
A               COMPLEX   = Array[10]

I already wrote to french contact of Harris, being unable to report/seek help on the L3Harris site.