Splendor rules regarding tokens (gem coins) state:
A player can never have more than 10 tokens at the end of their turn (including jokers). If this happens, they must return tokens until they only have 10 left. A player can return all or some of those they’ve just drawn....
That phrase "those they've just drawn" is used ambiguously.
1) Does the phrase "those they've just drawn" mean you can return only those drawn on that turn? That doesn't make sense, but the phrase could be interpreted that way (or not). Or does it simply mean that you aren't required to hold newly acquired coins for a turn?
2) Does the phrase "return all" mean that the player can return literally any number of their coins to the bank without purchasing, no matter when they were acquired?
3) Can you return coins without purchasing, even if you are below the 10 token limit?