view README @ 23814:6a5877a73141

setdiscovery: drop the 'always' argument to '_updatesample'

This argument exists because of the complex code flow in '_takequicksample'. It
first gets the list of heads and then calls '_updatesample' on an empty initial
sample and a size limit matching the differences between the number of heads and
the target sample size. Finally the heads and the sample from '_updatesample'
were added. To ensure this addition result had the exact target length, the code
had to ensure no elements from the heads were added to the '_updatesample'
content and therefore was passing this "always included set of heads".

Instead we can just update the initial heads sample directly and use the final
target size as target size for the update.

This removes the need for this 'always' parameter to the '_updatesample' function

The test are affected because different set building order results in different
random sampling.

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