tpl/collections: Fix and deprecate echoParams

Fixes #11498

tpl/collections/integration_test.go

@@ -231,3 +231,37 @@ foo: bc
 	).Build()
 	b.AssertFileContent("public/index.html", "<ul><li>P1</li><li>P2</li></ul>")
 }
+
+// Issue #11498
+func TestEchoParams(t *testing.T) {
+	t.Parallel()
+	files := `
+-- hugo.toml --
+[params.footer]
+string = 'foo'
+int = 42
+float = 3.1415
+boolt = true
+boolf = false
+-- layouts/index.html --
+{{ echoParam .Site.Params.footer "string" }}
+{{ echoParam .Site.Params.footer "int" }}
+{{ echoParam .Site.Params.footer "float" }}
+{{ echoParam .Site.Params.footer "boolt" }}
+{{ echoParam .Site.Params.footer "boolf" }}
+	`
+
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).Build()
+	b.AssertFileContent("public/index.html",
+		"foo",
+		"42",
+		"3.1415",
+		"true",
+		"false",
+	)
+}