coalesce method
Mutable version of NullCheckExtension.coalesce.
Setting the value of the returned cell sets the value of this
cell.
Implementation
MutableCell<T> coalesce(ValueCell<T> ifNull) => (this as ValueCell<T?>)
.coalesce(ifNull)
.mutableApply((p0) => p0, (p0) {
value = p0;
}, key: _MutableNullCheckCoalesceKey(this, ifNull));