1. I try to select:

sqlite> select save_date from photo_tags where save_date<2454612.21079943 
limit 1 offset 3073;
save_date = 2454612.21079943

But 2454612.21079943<2454612.21079943 is wrong result.

2. And I try

sqlite> select save_date from photo_tags where save_date=2454612.21079943;
sqlite>  

So, sqlite calculate 2454612.21079943!=2454612.21079943 

3. And this query working correctly:

sqlite> select save_date from photo_tags where save_date=(select save_date 
from photo_tags where save_date<2454612.21079943 limit 1 offset 3073);
save_date = 2454612.21079943

Table is like

CREATE TABLE photo_tags
(
  save_date REAL,
...
);
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