The total size of the 19 globals exported for future expression (‘FUN()’) is 2.87 GiB.. This exceeds the maximum allowed size of 500.00 MiB (option 'future.globals.maxSize'). The three largest globals are ‘FUN’ (2.55 GiB of class ‘function’), ‘raw_umi’ (272.22 MiB of class ‘S4’) and ‘as.matrix’ (34.70 MiB of class ‘function’)