Readme.

README.md

@@ -25,6 +25,25 @@ Yet another  command line tool for reading and manipulating yaml files, built on
     ./vendor/bin/yaml-cli update:key somefile.yml old-key new-key
     ./vendor/bin/yaml-cli update:value somefile.yml some-key some-value
 
+    # Cast to boolean.
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key false
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key true
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 0 --type=boolean
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 0 --type=bool
+
+    # Cast to null.
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key null
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key ~ --type=null
+
+    # Cast to integer.
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 1 --type=integer
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 1 --type=int
+
+    # Cast to float/double/real.
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 1.0 --type=float
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 1.0 --type=double
+    ./vendor/bin/yaml-cli update:value somefile.yml some-key 1.0 --type=real
+
 ### Similar tools:
 
 - Javascript - https://github.com/pandastrike/yaml-cli

tests/phpunit/UpdateValueCommandTest.php

@@ -116,6 +116,7 @@ public function getValueProvider(): array
             [$file, 'string.1', 'true', 'string', 'true', "The value for key 'string.1' was set to 'true' (string) in $file.", 0],
             [$file, 'string.2', 'null', 'string', 'null', "The value for key 'string.2' was set to 'null' (string) in $file.", 0],
             [$file, 'null.0', 'null', null, null, "The value for key 'null.0' was set to 'null' (NULL) in $file.", 0],
+            [$file, 'null.0', '~', 'null', null, "The value for key 'null.0' was set to '~' (NULL) in $file.", 0],
             [$file, 'float.0', '1.0', 'float', 1.0, "The value for key 'float.0' was set to '1.0' (double) in $file.", 0],
             [$file, 'float.1', '1.0', 'double', 1.0, "The value for key 'float.1' was set to '1.0' (double) in $file.", 0],
             [$file, 'float.2', '1.0', 'real', 1.0, "The value for key 'float.2' was set to '1.0' (double) in $file.", 0],