pa_atoi64() is needed at least for parsing latency offset values in pacmd and pactl. Currently pa_atod() is used as a workaround, but it's not nice to accept fractional numbers when the values are only used as integers.
Sorry, I misremembered the length of microsecond - I thought that it was one billionth of a second, but since it's actually one millionth, the latency offset can be parsed as a 32-bit integer (the available range from roughly -2000 seconds to roughly 2000 seconds should be enough for everybody).
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