Clarified the behavior of NaNs on IEEE platforms regarding signaling and quiet NaNs.
attempting to unpack a bytes string containing an IEEE INF or NaN will raise an
exception.
-Note that NaNs type may not be preserved on IEEE platforms (silent NaN become
-quiet), for example on x86 systems in 32-bit mode.
+Note that NaNs type may not be preserved on IEEE platforms (signaling NaN become
+quiet NaN), for example on x86 systems in 32-bit mode.
On non-IEEE platforms with more precision, or larger dynamic range, than IEEE
754 supports, not all values can be packed; on non-IEEE platforms with less