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The text trimmed of surrounding whitespace, or Nothing when nothing remains. A value that is empty or all-whitespace is treated as absent -- the idiom an environment lookup or an optional configuration field wants for "present but blank means unset". The surviving text is returned trimmed, so a caller never has to strip it a second time.

Drop a single trailing '/' from a URL base when present, leaving any other base untouched. At most one slash is removed, and the function is idempotent on a base that already carries none.

Join a URL base and an already-encoded path with exactly one '/', tolerating one trailing slash on the base so the join never doubles it. The path is appended verbatim -- this neither encodes nor validates it.

Render a UTCTime as the ISO-8601 instant iso8601Show produces, byte-for-byte, at a fraction of the allocation cost: a handful of digit writes into a builder instead of the general time formatting machinery. The packument serve path re-renders one instant per surviving version per request (the served time map is rebuilt from the merge plan's normalised instants), so the formatter sits on a hot loop where the general machinery's cost is paid thousands of times per request.

The fast path covers the whole real-world domain: years 0-9999 and a time-of-day below 86 400 s. An input outside it (an expanded-representation year, a leap-second reading) delegates to iso8601Show itself, so parity is total by construction and property-tested byte-for-byte in TextSpec. The fractional second renders exactly as iso8601Show does: omitted when zero, else the picosecond digits with trailing zeros trimmed.