Is it normal for mobx to modify @ observable with ES6's setter stored value function?

I tried normal and effective in non-strict mode

Es7 mobx
Mar.18,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2c10b-2bacb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2c10b-2bacb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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