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If sqlite3 is built with double-quoted string literals disabled (which is recommended, see https://www.sqlite.org/compile.html#dqs), diskcache starts failing with the following crypting error:
This is because the syntax
WHERE key = "size"
in standard SQL refers to a column named "size", not a string literal. Parsing this as a string literal is a conditional sqlite extension.This patch makes the code more robust by avoiding this optional sqlite feature.