Stefan's env tweaks

Author: sholderbach

blog/2024-04-30-nushell_0_93_0.md

@@ -103,16 +103,32 @@ Thanks to all the contributors below for helping us making the documentation of
 See a full overview of the [breaking changes](#breaking-changes-toc)
 :::
 
-The environment variable list form of `with-env` is now deprecated aftter [#12523](https://github.com/nushell/nushell/pull/12523):
+Passing environment variables to `with-env` via the list-like or single-row table form is now deprecated after
+[#12523](https://github.com/nushell/nushell/pull/12523):
+
 ```nushell
+# deprecated
 with-env [X Y W Z] { $env.X }
+# also deprecated
+with-env [[X Y]; [W Z]] { $env.X }
 ```
 
-Instead, one should use the record form:
+Instead, you should use the record form:
+
 ```nushell
 with-env { X: 'Y', W: 'Z' } { $env.X }
 ```
 
+This also explicitly stops you from repeating the name of a environment variable, which was a potential source of
+bugs.
+
+```nushell
+# silently: bar
+with-env [X foo X bar] { $env.X }
+# error
+with-env { X: 'foo', X: 'bar' } { $env.X }
+```
+
 Additionally, setting the `PWD` variable through `with-env` is now disallowed.
 
 #### `load-env` [[toc](#table-of-content)]
@@ -121,8 +137,7 @@ Additionally, setting the `PWD` variable through `with-env` is now disallowed.
 See a full overview of the [breaking changes](#breaking-changes-toc)
 :::
 
-With [#12522](https://github.com/nushell/nushell/pull/12522), setting the `PWD` variable through `load-env` is now disallowed.
-
+With [#12522](https://github.com/nushell/nushell/pull/12522), setting the `PWD` variable through `load-env` is now disallowed, both when the record is given as a pipeline input or command argument.
 
 #### `last` [[toc](#table-of-content)]