Using xgb.train with more than 10^5 parameters and using the parameter interaction_constraints, I get the following error:

Error in xgb.iter.update(bst$handle, dtrain, iteration - 1, obj) :
[09:54:20] ./dmlc-core/include/dmlc/././json.h:788: Check failed: ch == ',' (101 vs. ,) : Error at Line 0, around ^+05,100001,100002,100003,100004,100005,100006,100007,100008,100, JSON array expect ']' or ','. Get 'e' instead

I suspect 100001, 100002 and so on represent feature indices with values more than 100 000.
I tried with feature indices with values less than 100 000, and it worked.

Am I right, and if so, can this be fixed?