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_content/blog: update GODEBUG documentation to clarify go.work behavior #301

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_content/blog: update GODEBUG documentation to clarify go.work behavior #301

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13 changes: 7 additions & 6 deletions _content/blog/compat.md
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Expand Up @@ -461,12 +461,13 @@ For the remaining programs, the new approach is:
`/godebug/non-default-behavior/http2client:events` counts the
number of HTTP transports that the program has configured without HTTP/2 support.

4. A program’s GODEBUG settings are configured to match the Go version
listed in the main package’s `go.mod` file.
If your program’s `go.mod` file says `go 1.20` and you update to
a Go 1.21 toolchain, any GODEBUG-controlled behaviors changed in
Go 1.21 will retain their old Go 1.20 behavior until you change the
`go.mod` to say `go 1.21`.
4. A program’s GODEBUG settings are configured to match the Go version
listed in either the main package's `go.mod` file or in a `go.work` file,
with the `go.work` file taking priority if both are present.
If your program's `go.mod` file says `go 1.20` (or the `go.work` file specifies `go 1.20`)
and you update to a Go 1.21 toolchain, any GODEBUG-controlled behaviors
changed in Go 1.21 will retain their old Go 1.20 behavior until you update
the relevant `go.mod` or `go.work` file to say `go 1.21`.

5. A program can change individual GODEBUG settings by using `//go:debug` lines
in package `main`.
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