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PHPUnit: update configuration 
 
PHPUnit just released version 9.5.10 and 8.5.21. 
 
This contains a particular (IMO breaking) change: 
 
> * PHPUnit no longer converts PHP deprecations to exceptions by default (configure `convertDeprecationsToExceptions="true"` to enable this) 
 
Let's unpack this: 
 
Previously (PHPUnit < 9.5.10/8.5.21), if PHPUnit would encounter a PHP native deprecation notice, it would: 
1. Show a test which causes a deprecation notice to be thrown as **"errored"**, 
2. Show the **first** deprecation notice it encountered and 
3. PHPUnit would exit with a **non-0 exit code** (2), which will fail a CI build. 
 
As of PHPUnit 9.5.10/8.5.21, if PHPUnit encounters a PHP native deprecation notice, it will no longer do so. Instead PHPUnit will: 
1. Show a test which causes a PHP deprecation notice to be thrown as **"risky"**, 
2. Show the **all** deprecation notices it encountered and 
3. PHPUnit will exit with a **0 exit code**, which will show a CI build as passing. 
 
This commit reverts PHPUnit to the previous behaviour by adding `convertDeprecationsToExceptions="true"` to the PHPUnit configuration. 
 
Refs: 
* https://github.com/sebastianbergmann/phpunit/blob/9.5/ChangeLog-8.5.md 
* https://github.com/sebastianbergmann/phpunit/blob/9.5/ChangeLog-9.5.md 
Better distinguisher of ristretto polyfill 
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