This changes the output of Number and Range fields, when previewed—and makes placeholder values of Range fields in element card attribute designers more “believable” for the field’s configuration.

• Number — Prepends the prefix and appends the suffix to formatted values, when they’re specified. Placeholder values remain unchanged; I wasn't sure how to generate convincing values in cases where the min and/or max settings were absent!
• Range — Appends the suffix to formatted decimal values, when specified. Placeholder values now respect the min, max, and step settings.

I elected to not introduce whitespace between the value and pre/suffix. This may be unsightly if to-date, developers had relied on the margin around inputs!

See also:

• "Number" card attributes should include prefix/suffix when enabled #16336
• “In-bound” Color Field Previews #16985

Current state of number fields, configured with a prefix and suffix:

New output in element indexes:

New output in element card attribute designer: