pkg syscall (freebsd-arm64), const DLT_FLEXRAY ideal-int
pkg syscall (freebsd-arm64), const DLT_FRELAY = 107
pkg syscall (freebsd-arm64), const DLT_FRELAY ideal-int
pkg syscall (freebsd-arm64), const DLT_FRELAY_WITH_DIR = 206
pkg syscall (freebsd-arm64), const DLT_FRELAY_WITH_DIR ideal-int
pkg syscall (freebsd-arm64), const DLT_GCOM_SERIAL = 173
pkg syscall (freebsd-arm64), const DLT_GCOM_SERIAL ideal-int

pkg syscall (darwin-arm64), const IFT_FAITH ideal-int
pkg syscall (darwin-arm64), const IFT_FDDI = 15
pkg syscall (darwin-arm64), const IFT_FDDI ideal-int
pkg syscall (darwin-arm64), const IFT_FRELAY = 32
pkg syscall (darwin-arm64), const IFT_FRELAY ideal-int
pkg syscall (darwin-arm64), const IFT_FRELAYDCE = 44
pkg syscall (darwin-arm64), const IFT_FRELAYDCE ideal-int
pkg syscall (darwin-arm64), const IFT_GIF = 55

the HTTP client and the HTTP server.
It is also possible to set the default `GODEBUG` for a given program
(discussed below).

When preparing any change that is permitted by Go 1 compatibility
but may nonetheless break some existing programs,
we first engineer the change to keep as many existing programs working as possible.
For the remaining programs,
we define a new GODEBUG setting that

pkg syscall (freebsd-riscv64), const DLT_FLEXRAY ideal-int #53466
pkg syscall (freebsd-riscv64), const DLT_FRELAY = 107 #53466
pkg syscall (freebsd-riscv64), const DLT_FRELAY ideal-int #53466
pkg syscall (freebsd-riscv64), const DLT_FRELAY_WITH_DIR = 206 #53466
pkg syscall (freebsd-riscv64), const DLT_FRELAY_WITH_DIR ideal-int #53466
pkg syscall (freebsd-riscv64), const DLT_GCOM_SERIAL = 173 #53466

giving the GitHub issue number of the proposal issue that accepted
the new API. This helps with our end-of-cycle audit of new APIs.
The same requirement applies to next/* (described below), which will
become a go1.XX.txt for XX >= 19.

The next/ directory contains the only files intended to be mutated.
Each file in that directory contains a list of features that may be added