What would a negative size attachment be?

[rokejulianlockhart.rymcmt (third="Beedell", first="Roke")]

@rokejulianlockhart.rymcmt

0. Perhaps I should report this at https://bugzilla.mozilla.org/enter_bug.cgi#h=bugForm|Thunderbird as

Negative attachment size allowed in “Share for files larger than”

1850281 - Negative attachment size allowed in “Share for files larger than”.

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