"type: Cash" doesn't seem to work

[frivoal]

https://hledger.org/journal.html#declaring-account-types says that account assets:bank ; type: Cash is a thing that should work. Actually adding this directive to a journal gives me an error:

$ hledger cashflow
hledger: in file included from ***redacted***,
***redacted***:3:1:
  |
3 | account assets:bank  ; type: Cash
  | ^
invalid account type code Cash, should be one of A, L, E, R, X, ASSET, LIABILITY, EQUITY, REVENUE, EXPENSE

I'd like to use this to limit which accounts are considered cash for cashflow reports, but no luck so far.

$ hledger --version
hledger 1.18.1

[simonmichael]

The default web manuals are for hledger master; see the versions at the top.