PreparedRegistrations.registerIfNeeded

If already registered, simply returns the cached Payload.

struct PreparedRegistrations(Payload)
Payload
registerIfNeeded
(
string sql
,
Payload delegate
(
string
)
doRegister
)
out (info) { assert (!info.queuedForRelease); }
if (
isPreparedRegistrationsPayload!Payload
)

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