Concerns have been addressed by commits:
a5a63cee9b Redraw if the random number is too close to max, to avoid modulo bias
fbf0f42532 Documenting xbt/random a little bit
037217ec21 Exclude max from range for xbt::random::uniform_real.
SimGrid (3.25.1) UNRELEASED (target: March 20 2020 or v3.26 on 3/26/20)
+Fixed bugs (FG#.. -> framagit bugs; FG!.. -> framagit merge requests):
+ - FG#43: xbt::random needs some care
+ - FG!24: Documentation and fix for xbt/random
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