[BUG] Value is not included on some HTML tags if the supplied value is 0, False, None or ""

[dan-hoog]

Overall liking FastHTML and making progress on some tools.

Sample Code below illustrates this - by outputting a SELECT form both ways and showing the results is posted below:

If you're reporting a bug, please continue with this template.

Describe the bug
I find that using select (I think other form elements as well), some legal HTML values for Value are not generated, resulting in odd behavior on the generated page.

Within a form and an empty string as a VALUE, the output OPTION does not generate with a value field. The response value on the form becomes the payload text.

Minimal Reproducible Example

@app.route("/test")
    def get():
        manual_form = NotStr("""<FORM METHOD="POST" ACTION="/test/manual_form">
                        <SELECT NAME="test_select_field">
                        <OPTION VALUE="">Option 0</OPTION>
                        <OPTION VALUE="1">Option 1</OPTION>
                        <OPTION VALUE="2">Option 2</OPTION>
                        </SELECT>
                        <INPUT TYPE="submit" VALUE="Submit">
                        </FORM>
                     """)
        return Div(P(f"Test route with parameter"),
                   P("Select Form Generated by FastHTML",
                   Form(Select(Option("Option 0", value=""), Option("Option 1", value="1"), Option("Option 2", value="2"), NAME="test_select_field"), 
                        Input(type="submit", value=f"Submit"),
                        Method="POST", Action=f"/test/fasthtml_form",)),
                   P("Select Form from Raw HTML", manual_form),
                   )
    
    @app.route("/test/{parameter}")
    def post(post_args: dict, parameter: str):
        print(f"fastcrud_test_post with parameter {parameter}")
        print(f"Result of test_select_field is |{post_args['test_select_field']}|")
        return P(f"Test result - POSTED - parameter {parameter}"), P(f"returned value for test_select_field |{post_args['test_select_field']}|", )

Expected behavior
A clear and concise description of what you expected to happen.
The empty values should be emitted as VALUE=v in the generated HTML so they are properly reflected in HTML actions.

Environment Information
Please provide the following version information:

• fastlite version: 0.0.11
• fastcore version: 1.7.19
• fasthtml version: 0.6.14

Confirmation
Please confirm the following:

• [X ] I have read the FAQ (https://docs.fastht.ml/explains/faq.html)
• [X ] I have provided a minimal reproducible example
• I have included the versions of fastlite, fastcore, and fasthtml
• [X ] I understand that this is a volunteer open source project with no commercial support.

Additional context
Add any other context about the problem here.
Generated HTML from the /test example provided:

  | -- | --   |   |   | <title>FastHTML page</title>   |   |   | <script src="https://unpkg.com/htmx.org@next/dist/htmx.min.js"></script><script src="https://cdn.jsdelivr.net/gh/answerdotai/[email protected]/fasthtml.js"></script><script src="https://cdn.jsdelivr.net/gh/answerdotai/surreal@main/surreal.js"></script><script src="https://cdn.jsdelivr.net/gh/gnat/css-scope-inline@main/script.js"></script>   | <style>:root { --pico-font-size: 100%; }</style>   | <style>:root { --pico-font-size: 65%; }</style>   |   |   |   |

  |

Test route with parameter

  |

  | Select Form Generated by FastHTML

Option 0Option 1Option 2   |

  |

  | Select Form from Raw HTML

  |   | Option 0   | Option 1   | Option 2   |   |   |   |

  |

  |   |  

Screenshots
If applicable, add screenshots to help explain your problem.
Console response from fasthtml select form:
fastcrud_test_post with parameter fasthtml_form
Result of test_select_field is |Option 0|

Console response from raw html select form
fastcrud_test_post with parameter manual_form
Result of test_select_field is ||