Implicit conversion from float to int loses precision (Parser/SilenceParser.php line 61)

I'm running this via the auto-m4b Docker container, and in several cases I'm getting:

an error occured, that has not been caught:
Array
(
    [type] => 8192
    [message] => Implicit conversion from float 1000313.76 to int loses precision 
    #                                                                         ^ (or some variation on this value)
    [file] => phar:///usr/local/bin/m4b-tool/src/library/M4bTool/Parser/SilenceParser.php
    [line] => 61
)

I figured this was related to looking for chapter silence with --max-chapter-length=15,30 but oddly I've tried without this option entirely and it still seems to crop up.

Best I can tell it's related not to line 61 (there's nothing there) but to one of the TimeUnit or millisecond() calls there – looking at https://github.com/sandreas/php-time/blob/master/src/Sandreas/Time/TimeUnit.php, it looks like it's supposed to handle both float and int values, but since this is compiled running in Docker, I don't really know how to test or troubleshoot. If anyone can tell at a glance what might be going on, or suggestions on debugging, please let me know.

Past that, I'm not sure if this is philosophically a bug in TimeUnit, or whether the values should just be rounded to ints in SilenceParser source here, like:

// Round down and convert to int to ensure we don't cut any sound off
$end = new TimeUnit((int)floor($matches[1]), TimeUnit::SECOND);
// Again, round down the duration to avoid loss and convert to int
$silenceDuration = new TimeUnit((int)floor($matches[2]), TimeUnit::SECOND);
// Start should be rounded up
$start = new TimeUnit((int)ceil($end->milliseconds() - $silenceDuration->milliseconds()), TimeUnit::MILLISECOND);

$this->silences[$start->milliseconds()] = new Silence($start, $silenceDuration);

sandreas / m4b-tool

Implicit conversion from float to int loses precision (Parser/SilenceParser.php line 61) #247