Introduce TermOperator helper and refactor execute()s to use replaceSubjectMatchingTerm

src/vm/commands/quote.ts

@@ -38,8 +38,8 @@ export class Quote extends Command<{ with?: StrTerm }> {
     }
 
     execute(vm: StrVM, data: { with?: StrTerm }): Awaitable<StrVM> {
-        return vm.tapInPlace(ctx =>
-            ctx.replaceSubjectAsString(sub => {
+        return vm.replaceContextMatchingTerm(ctx => ({
+            string: sub => {
                 let quote = '\''
                 if ( data.with ) {
                     quote = ctx.resolveString(data.with)
@@ -47,6 +47,7 @@ export class Quote extends Command<{ with?: StrTerm }> {
 
                 sub = stripQuotemarkLayer(sub)
                 return `${quote}${sub}${quote}`
-            }))
+            }
+        }))
     }
 }