[boost] icl

Hello all, I am new here... I recently used icl and ran into a rather surprising behavior: Assertion failed: (numeric_minimum::value> ::is_less_than_or(upper(object), is_right_closed(object.bounds())) ), file ...\boost\icl\concept\interval.hpp, line 438 This is the code to produce the problem: #include int main() {   boost::icl::discrete_interval x{0, 0};   boost::icl::discrete_interval y{0, 1};   boost::icl::contains(x, y); } Note that the assertion fails only with size_t not with int. What could be reason for this?