True when x is a break:start / get_current_break payload safe to drive the overlay. Checks only the fields the overlay depends on; the rest is trusted from the backend (and read defensively at the use site).
x
break:start
get_current_break
True when
xis abreak:start/get_current_breakpayload safe to drive the overlay. Checks only the fields the overlay depends on; the rest is trusted from the backend (and read defensively at the use site).