This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
There is no normative requirement regarding the ability of floating-point values to represent integer values exactly; however, 7.3.11 [conv.fpint] paragraph 2 appears to implicitly rely on their ability to represent the values 0 and 1:
If the source type is bool, the value false is converted to zero and the value true is converted to one.
Rationale (October, 2015):
CWG felt that the cited passage should be read as indicating that converting true and false should have the same result as converting 1 and 0 and thus do not imply a requirement that those values be represented exactly.