Good news, I added logging to get the actual value, which is 17972343 bytes. [The display is using the binary definition of a byte and not the decimal definition](https://en.wikipedia.org/wiki/Byte#Multiple-byte_units). Without lexical shortlist: 17,140,961 + 831,382 = 17972343 bytes / (1024 * 1024) = 17.1397 MB The 17.14 MB reported does look suspiciously just like the decimal definition of a byte model value, but it is just coincidental.
Bug 1947822 Comment 11 Edit History
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Good news, I added logging to get the actual value, which is 17972343 bytes. [The display is using the binary definition of a byte and not the decimal definition](https://en.wikipedia.org/wiki/Byte#Multiple-byte_units). Without lexical shortlist: 17,140,961 + 831,382 = 17972343 bytes / (1024 * 1024) = 17.1397 MiB The 17.14 MB (really MiB) reported does look suspiciously just like the decimal definition of a byte model value, but it is just coincidental.