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5d98ba68f5
MSSQL's substring() implementation is somehow silly/strict and unable to perform implicit casts to integer both for the start and length parameters. This hits Moodle badly because of another problems (MDL-23997) we decided to cast to string all bound placeholders long ago. So this commit just enforces the cast of the start and length parameters to integer. And includes unit tests for using placeholders on all positions in the sql_substr() method.