The IPropertyList interpolation handler treated any {value:#} as a cliloc marker
(emit '#<value>'). But cliloc numbers are integers; a float/double/decimal with '#'
is the standard custom-numeric (digit-placeholder) format, not a cliloc reference.
Gate the marker on an integer value type so float/double/decimal {x:#} formats
normally, narrowing the ambiguity to the harmless {0:#} integer case ('#0').
Adds ObjectPropertyListSpanAddTests.HashFormat_OnlyMarksIntegers: int {value:#}
emits '#<value>'; double {value:#} uses the standard '#' format (no leading '#').
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bcb1da47eb