Release v0.12.19

• fix gsub and sub when the replacement emits multiple values
• fix fmax, fmin, modf functions against NaN and infinities
• fix join/1 to use add/0 implementation and handle null separator
• fix del and delpaths on null to emit null
• fix arithmetic operations on the minimum integer
• fix significand function against subnormal numbers
• fix handling of -- in cli flag parsing for jq compatibility
• fix flatten/1 to emit error when the depth is NaN
• fix array slice update to validate index types
• fix string repetition boundary check to match jq behavior
• implement splits/2 using match/2 for better jq compatibility
• implement to_entries and from_entries in jq for simplicity
• improve performance of regexp functions by caching compiled regexps