Conditional Sections

[trieloff]

In order to enable testing and personalization on a section-level, conditional sections allow two modes of operation:

1. strain-dependent sections: sections that have a strain property set, will only be included in the output if the current strain equals either the value of strain or equals any value of strain if strain is an array.
2. tested sections: sections that have a test property set will only be included in the output if a test selection algorithm has selected them from all other sections that have the same test value. The algorithm will group all sections based on their test value, then hash the section's contents and the current strain name and select the section with the lowest hash value. This algorithm creates a selection that is random, but stable for stable content and strain names.