core/src/main/java/org/trimou/handlebars/AbstractHelper.java
protected void append(Options options, CharSequence sequence) {
        TextSupport textSupport = this.textSupport;
        if (textSupport == null || isUnescapeVariable(options)) {
            options.append(sequence);
        } else {
            try {
                textSupport.appendEscapedHtml(sequence.toString(),
                        options.getAppendable());
            } catch (IOException e) {
                throw new MustacheException(MustacheProblem.RENDER_IO_ERROR, e);
            }
        }
    }
protected void append(Options options, CharSequence sequence) {
        TextSupport textSupport = this.textSupport;
        if (textSupport == null || isUnescapeVariable(options)) {
            options.append(sequence);
        } else {
            try {
                textSupport.appendEscapedHtml(sequence.toString(),
                        options.getAppendable());
            } catch (IOException e) {
                throw new MustacheException(MustacheProblem.RENDER_IO_ERROR, e);
            }
        }
    }
Escape appended sequence if needed.

@param options
@param sequence
@see TextSupport