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I have a weird bug with Memcached. I get data from MySQL via Doctrine and save the result in Memcached. On of the fields is serialized table

a:20:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:4;i:4;i:5;i:5;i:9;i:6;i:10;i:7;i:11;i:8;i:3;i:9;i:6;i:10;i:7;i:11;i:8;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;}

It is perfectly OK, this table unserialize correctly. But recently I got weird error with Memcached:

Memcached::get(): could not unserialize value

Any guess what is going on? Others rows which also uses serialized data works fine. One of the rows even have the same array serialized and it works.

Tom
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